Supplementary Figures 1 2 Supplementary Figure Legends Figure S1. Cre expression pattern in the uterine epithelia. (A-D) K5Cre expression in the uterine epithelia from E16.5 to postnatal days. (A) At E16.5, K5Cre expression is observed in a few numbers of epithelial cells. (B) K5Cre expression in the uterine epithelium is broader in the uterine epithelium as compared to E16.5. (C-D) At postnatal stages, K5Cre is expressed in most cells of the uterine epithelia. Magnification: (A-D) x100. Bar: 200 m. Figure S2. Formation of stratified uterine epithelia in the LOF mutants of-catenin grafted in non-ovariectomized hosts. (A, B) Hematoxylin and eosin (H&E) staining of control and K5Cre;Catnbfl/fl mutant uteri grafted for 4 weeks in non-ovariectomized nude mice. (A-A’) Control uteri exhibit single-layered, columnar epithelium and UGs. (B-B’) In K5Cre;Catnbfl/fl mutant uteri, the epithelium becomes stratified layer with squamous cell shape. (C-C’, D-D’) Immunostaining analysis indicates loss of catenin expression in the mutant uterine epithelium. (E-E’, F-F’) Cyclin D1 expression is reduced in the mutant uterine epithelium (green arrowheads). (G-G’, H-H’) Foxa2 expression is also reduced in the mutant uterine epithelium. Mutant uterine epithelium is altered into a stratified epithelium as shown by the expressions of (I-I’, J-J’) Keratin 14 and (K-K’, L-L’) p63, which are markers for stratified epithelia. Magnification: (A-L) x40; (A’-L’) x400, higher magnification of the boxed areas. Bars: 500 m and 50 m. UG: uterine glands. Figure S3. Average glandular number and cell proliferation rate in the GOF mutants of-catenin grafted in non-ovariectomized hosts. (A) Average number of glands in the GOF mutants of-catenin (n=3). The number of glands in the mutant uterine grafts is significantly increased as compared with the control uterine grafts. (B-C) The cell proliferation rate (%) in the mutant uterine grafts is significantly increased as shown in the graphs of (B) pH3 expressing cells and (C) Ki67 expressing cells. Data are presented as 3 mean ± s.e.m. of three replicates in three independent experiments. Statistical significance was calculated using the Student’s t-test followed by F-test (*p < 0.05). Figure S4. Normal mRNA expression levels in different endometrial cell lines. mRNA expression levels of -catenin, Foxa2, cyclin D1 in UE2AA, Ishikawa, ECC-1 and ARK-1 cell lines. -actin is utilized as endogenous control for human cell lines such as Ishikawa, ECC-1 and ARK-1 while mL8 is utilized for the mouse endometrial cell line UE2AA. Figure S5. Knockdown of Foxa2 in different endometrial cell lines. Western blot analyses show the reduced expression of Foxa2 after transfection with Foxa2 siRNA in UE2AA, Ishikawa, ECC-1 and ARK-1 cell lines. Western blot analyses show the augmented expression of Foxa2 after transfection with Foxa2 overexpression vector in UE2AA, Ishikawa and ECC-1 cell lines. OE: overexpression. Red arrow indicates the molecular weight of the Foxa2 protein. -tubulin is utilized as endogenous control. Figure S6. Cell cycle analyses in UE2AA, ECC-1 and ARK-1 cell lines after the knockdown of Foxa2. (A) UE2AA cell line shows increased percentages of cells undergoing G1 phase and decreased percentages of cells undergoing S and G2/M phases of the cell cycle. (B) Cell cycle analysis in ECC-1 shows no differences in the percentages of cells undergoing G1, S and G2/M phases of the cell cycle. (C) ARK-1 cell line shows increased percentages of cells undergoing G1 phase and decreased percentage of cells undergoing S and G2/M phases of the cell cycle. 4 Supplementary Materials and Methods Human specimens Tissue specimens were obtained from three eutopic endometria specimens, 28 complex atypical endometrial hyperplasia specimens, 23 G1 and 18 G3 EACs specimens. mRNA samples were obtained from six eutopic endometria and six complex atypical endometrial hyperplasia human specimens. The human specimens were frozen at the time of surgery at the Keio University Hospital after obtaining patients' informed consent. All tumors were histologically classified and further analyzed by experienced gynecological pathologists in Keio University Hospital using standard World Health Organization criteria (Hirasawa et al 2003). Mice and Uterine Grafting The Catnbfl/fl (Huelsken et al 2001), Catnb(ex3)fl/+ (Harada et al 1999), Keratin (K) 5Cre (Tarutani et al 1997), and ROSA26R (Soriano 1999) strains were used in this study. Adult female nude mice were purchased from Charles River (Wilmington, MA). Renal capsule grafting was conducted as described previously (Cunha 1976, Kurita et al 2004). For embryonic sampling, pregnant females were sacrificed on embryonic day (E) 18.5 and the uteri were isolated and dissected into halves and prepared for renal capsule grafting. Fourweek-old female nude mice were ovariectomized and maintained for two weeks to reduce systemic ovarian steroid hormones to basal levels. Renal capsule grafting of the uteri was performed two weeks after ovariectomy or in non-ovariectomized nude mice. After two weeks of rest, the nude mice were weighed and anesthetized with Pentobarbital Sodium Salt (Tokyo Chemical Industry Co. LTD, Japan) solution. The back skin at the area of incision was swabbed with 70% ethanol. Incision along the midline was made at the back skin and the mouse was placed on its side while locating the kidney through the body wall. Small incision 5 was then made in the body wall just enough for the size of the kidney. The kidney was popped out of the hole and gently made an incision (or pocket) between the capsule and the parenchyma of the kidney. The uterine grafts were inserted in these pockets. In host nude mice, the left kidney was designated for control grafts while the right kidney was designated for mutant graft to insure the same hormonal and growth conditions for the control and mutant uteri transplants. After grafting, the kidney was eased back into the body cavity. The incision of the body cavity was closed and sutured and the back skin was also closed with the aid of wound clip. The animals were sacrificed 4 weeks after renal capsule grafting. (Detailed procedure and visual presentation of renal capsule grafting is available in this site http://mammary.nih.gov/tools/mousework/Cunha001/index.html). All animal experiments were performed according to the regulations set by the animal study committee of Wakayama Medical University, Wakayama, Japan and Kumamoto University, Kumamoto Japan. Cell lines The human uterine adenocarcinoma cell line, ECC-1, was obtained from American Type Culture Collection (ATCC). ECC-1 cell line was maintained in RPMI-1640 medium (Wako, Osaka, Japan) with 5% Fetal Bovine Serum (FBS). ECC-1 has been authenticated by the ATCC. Ishikawa cell line another human-endometrial adenocarcinoma cell line of epithelial origin was obtained from European Collection of Cell Cultures (ECACC). Ishikawa cell line was maintained in Dulbecco’ Modified Eagle Medium, DMEM (Wako, Osaka, Japan) with 10% FBS. Ishikawa cell line was authenticated by ECACC and revalidated its DNA profile with Short Tandem Repeat analysis by Japanese Collection of Research Bioresources, Tokyo, Japan. Uterine papillary serous adenocarcinoma (UPSC) ARK-1 cell line was obtained from Dr. Allesandro Santin (Guzzo et al 2012). ARK1 was maintained in RPMI-1640 medium (Wako, Osaka, Japan) with 10% FBS, 1% Penicillin 6 Streptomycin Solution and 0.3% fungizone, antimycotic solution (Invitrogen catalog No. 15290-018). Mouse endometrial cell line, UE2AA, was obtained from Dr. Yasuhiro Tomooka (Hanazono et al 1997). UE2AA cell line was maintained in DMEM/F12 (GIBCO, Tokyo, Japan) with 10% FBS and supplemented with 1% Insulin-Transferrin Selenium (ITS) solution. Cells were maintained at 37oC in an atmosphere containing 5% CO2. Histology, LacZ staining and Immunohistochemistry Hematoxylin and eosin staining (H&E) and immunohistochemistry were performed by standard procedures as previously described (Haraguchi et al 2007). For H&E staining, the samples were embedded in the paraffin and cut using the microtome with 6m thickness. To analyze the K5Cre expression in the uterine epithelia, we utilized K5Cre;Rosa26R system (Ahn and Joyner 2004). The K5Cre male mice were crossed with female Rosa26R Creindicator (R26R) mice to obtain K5Cre;R26R/R26R female offspring mice. LacZ staining was performed as previously described (Haraguchi et al 2007, Phippard et al 1999). Tissue sections were stained with primary antibodies as shown in the table below. Final visualization was done by means of the streptavidin-biotin system using diaminobenzine as final chromogen. Tissue sections were counterstained with Hematoxylin staining for 10 seconds. Immunostaining of -CATENIN, LEF-1 and FOXA2 in human specimen were scored by three different Researchers who were blinded to the study. -CATENIN, LEF-1 and FOXA2 slides were scored for the presence and absence of nuclear staining pattern. catenin scoring for each slide was determined according to the previous study (Scholten et al 2003). Histological score was obtained from each sample which ranged from 0 (no staining) to 3 (intense staining) and subjected to non-parametric analysis utilizing the Wilcoxon ranksum test. 7 Immunofluorescence was visualized using Alexa Fluor 488 or 546 IgG against primary antibodies (Molecular Probes/Invitrogen, Carlsbad, CA). Nuclear counterstaining for immunofluorescence was performed with Hoechst 33342 (Sigma-Aldrich, Munich, Germany). The cell proliferation rate (%) was determined by selecting three fields, counting the number of proliferating cells, and the subsequent calculations were calibrated with the total number of epithelial cells (1 000 cells) within three objective fields (200x). Experiments to determine the proliferation was repeated at least three replicates in three independent experiments. Photomicrographs were taken using the Olympus BX50 microscope and Olympus FV1000D confocal microscope (Olympus, Tokyo, Japan). Plasmid construction and Transfection of cell lines The -1,800/+79 bp DNA fragments of Foxa2 were cloned by PCR using mouse genomic DNA and were inserted into the pGL3 basic vector (Promega, Madison, WI). Full length of mouse Foxa2 was kindly provided by Dr. H. Sasaki (Kumamoto University, Japan). Generation of overexpression of mouse FoxA2 was done by ligating the coding sequence of mouse FoxA2 gene into pCS2+MT vector (Rupp et al 1994, Turner and Weintraub 1994). catenin overexpression vector was kindly provided by Drs. T. Yamaguchi, Polakis, O. Tetsu and F. McCormick. Cells were split 2 days before transient transfection and grown to 80% confluency. Transfection of cell line was performed using the Lipofectamine 2000 (Invitrogen, Carlsbad, CA) according to the manufacturer’s protocol. Cells were harvested after 48 hours and were screened for gene expression. For Luciferase assay, the firefly luciferase reporter constructs were transfected at 0.5 ug/plate along with 0.1 ug/plate of the Renilla (pRL-tk) reporter to permit normalization of transfection efficiencies. After 24 hours, cells were harvested in 1x passive lysis buffer (Promega, Madison, WI). Luciferase activity was measured by a Monolight 2010 luminometer utilizing the Dual-Luciferase Reporter Assay (Promega, Madison, WI) as indicated by the manufacturer. Luciferase Assay data 8 were presented as mean ± s.e.m. of more than three independent experiments to ensure reproducibility. Statistical analyses were performed using One-Way ANOVA followed by Bonferroni’s multiple comparison tests with the alpha level at 0.05. Primers used for PCR cloning of Foxa2 promoter region: AAACTCGAGGCGTAGTAGCTGCTCCA - Foxa2 3'; Foxa2 Forward: 5' Reverse: 5' – – TCCAAGCTTAAAAACGCCGGCAAGAAC - 3'. Primers used for mutagenesis of the TCF/LEF binding sites: Site 1 mutation: 5' – CGTAACTAACGCAGCCAGGGCAGT- 3'; Site 2 mutation: 5’ – CGGTGTGTCCAGGGTACTTTTCAGT- 3’; Site 3 mutation: 5’ – TTGGTGGCCTGTAGCGTGAGGCAA- 3’ and Mismatch mutation: 5' – TGGGCCTTGTGGGATGATCACCGT- 3'. Red color indicates the sites of mutation. Semi-quantitative and Quantitative Real- time PCR Endometrial cell lines were cultured in six-well-cultured plates (5 x 105 cells/well) and maintained in its designated media. Total RNA was extracted from the cell lines after 48 hours of culture or transfection. All RNA samples were reverse transcribed using the Superscript II first-strand synthesis system for RT-PCR (Invitrogen, Carlsbad, CA) with oligomer random primers (Takara, Japan). One microliter of the synthesized cDNA were mixed with AmpliTaq Gold polymerase (Applied Biosystems, NJ) for PCR. The expression level of each amplicon was calculated by normalizing each cDNA to -actin or mL8 as specified in the text. Two microliters of the synthesized cDNA were mixed with SYBR Green PCR master mix (Applied Biosystems, CA) for real time PCR. The expression level of each amplicon was calculated by normalizing each cDNA to E-cadherin and then calculated as the fold change compared with the control. Primers for Human sequences used were the following: -catenin Forward: 5'GCCGGCTATTGTAGAAGCTG - 3'; 9 -catenin Reverse: 5'- GAGTCCCAAGGAGACCTTCC - 3' (Park et al 2008). Foxa2 Forward: 5'- ACACCACTACGCCTTCAACC - 3'; Foxa2 Reverse: 5'- GTGCATCACCTGTTCGTAGG 3' (Tang et al 2011). Cyclin D1 Forward: 5'- GAGCTGCTCCTGAACAAG - 3'; cyclin D1 Reverse: 5'- TTCAATGAAATCGTGCGGG - 3' (Suriano et al 2005). E-cadherin Forward: 5'- GACCAGGACTATGACTACTTGAAACG - 3'; E-cadherin Reverse: 5'- ATCTGCAAGGTGCTGGGTGAACCTT- 3' (Liu et al 2005). -actin Forward: 5'GATGAGATTGGCATGGCTTT- 3'; -actin Reverse: 5'- CACCTTCACCGTTCCAGTTT3' (Santra et al 2006). Primers for mouse sequences used were the following: -catenin Forward: 5'GCCTGTAGAGTTGCTGAGAGGGCT- 3'; -catenin Reverse: 5'- TCACTGCGTGAGTCACTCCCCAAA - 3' (Chen et al 2012). Foxa2 Forward: 5'CCCTGGCTGCAGACACTTCCTACT- 3'; Foxa2 Reverse: 5'- GAGGCCTGAAGTGTGGTGGCTACT- 3' (Li et al 2012). Cyclin D1 Forward: 5'GATGGCGATCGTCCTGTCATGCTG - 3'; cyclin D1 Reverse: 5'- ACCGGAGACTCAGAGCAAATCCCC- 3' (Lammie et al 1992). mL8 Forward: 5'ACAGAGCCGTTGTTGGTGTTG- 3'; mL8 Reverse: 5'- CAGCAGTTCCTCTTTGCCTTGT- 3 (Miyagawa et al 2009). Transfection of siRNA Control (ON-TARGET plus Non-targeting siRNA) and Foxa2 double stranded siRNAs (ON-TARGET plus Smart pool siRNA) were chemically synthesized (Dharmacon, Lafayette, CO, USA). Concentrations of Foxa2 siRNA were evaluated using the Negative Control siRNA Alexa Fluor 546 (Qiagen, Cambridge, MA) in endometrial cell lines. Ishikawa and ECC-1 cell lines were transfected with 25 nM of Foxa2 siRNA. UE2AA was transfected with 40 nM of Foxa2 siRNA. ARK-1 cell line was transfected with 30 nM of 10 Foxa2 siRNA. The cells were plated on six-well plates and cultured in its corresponding media. After 24 hours, the cells were transfected with Foxa2 siRNA using the Lipofectamine RNAiMAX (Invitrogen, Carlsbad, CA) according to the manufacturer’s protocol. Knockdown of Foxa2 was evaluated using the quantitative real-time PCR (qPCR), immunostaining and western blotting. ON-TARGET plus Smart pool Human Foxa2 siRNA sequences were the following: Foxa2 siRNA 1: GAACAUGUCGUCGUACGUG; Foxa2 siRNA 2: GCAGAUACCUCCUACUACC; Foxa2 siRNA 3: AAAUGGACCUCAAGGCCUA; Foxa2 siRNA 4: GAACACCACUACGCCUUCA. ON-TARGET plus Smart pool Mouse Foxa2 siRNA sequences were the following: Foxa2 siRNA 1:CCAAACCUCCCUACUCGUA; Foxa2 siRNA 2:UGAAUGGCAUGAACACAUA; Foxa2 siRNA 3: GGAAUGAGCCCGUCGCUAG; Foxa2 siRNA 4: CAAGCGAGGUGGCCUAAGC. Chromatin immunoprecipitation (ChIP) and Pull-down assays For ChiP assay, 12 pairs of uterine samples were dissected from Postnatal day 9 (P9) female embryos. ChIP Assay Kit (Millipore, NY, USA) was used in this study. -catenin (Santa Cruz, CA, USA), Foxa2 (Santa Cruz, CA) and acetyl-histone 3 (Upstate, Lake Placid, NY, USA) antibodies (2 g each) were used. Rabbit immunoglobulin (Dako, Denmark) antibody was used for mock control. For pull-down assay, 20 uterine samples from P9 female embryos were used. Wild Type (WT) or mutated Sites fragment bound to Streptavidin resin (Strategen, Santa Clara, CA) was incubated with 20 uterine samples lysed in the buffer (50 mM Tris·HCl (pH 7.5), 0.5 M NaCl, 5 mM EDTA, 1% Triton X-100, 1 mM 11 PMSF, protease inhibitor mixture). The beads were washed and analyzed with Western blotting against anti--catenin antibody. Experiments were performed in three independent experiments. For -catenin chip assay, the primers used were the following: Region 1: Forward 1: 5’- – CACCTCAGTCGGCCTGGA GAAGTCATCCCACAAGGCCCA GAGTCCCTTCCTTTACGTCCAC – 3’. – 3’; Reverse 1: 5’- Forward 2: 5’- Region 2: 3’; Reverse 2: 5’- GAGGAAACCCGAGATAAATAAATC – 3’. For cyclin D1 chip assay, the primers used were the following: Forward: 5’- GGGGCGATTTGCATTTCTAT- 3’; Reverse: 5’CGGTCGTTGAGGAGGTTGG- 3’(Yang et al 2011). Primers for pull-down assay were the following: Site 1 WT Forward: 5’CGTAACTAAAACAAACAGGGCAGTAGGTGGCCACCTACTGCCCTGTTTGTTTTAGTTACG- 3’; 3’; Site 1 WT Reverse: 5’- Site 1 Mutated Forward: 5’- CGTAACTAGCATAGGCAGTTCAGTAGGTGG- 3’; Site 1 Mutated Reverse: 5’CCACCTACTGAACTGCCTATGCTAGTTACGGGCCTCGGTGTTTCAAGGTTACTTTTCAG- 3’; 3’; Motif Motif 26 26 WT Forward: 5’- WT Reverse: 5’- CTGAAAAGTAACCTTGAAACACCGAGGCC- 3’; Motif 26 Mutated Forward: 5’GGCCTCGGTGTTGTACGTTTACTTTTCAG- 3’; Motif 26 Mutated Reverse: 5’CTGAAAAGTAAACGTACAACACCGAGGCC- 3’; Motif 27 WT Forward: 5’- CTTGGTGGCCTGCAAAGCGAGGCAAGCCAG- 3’; Motif 27 WT Reverse: 5’CTGGCTTGCCTCGCTTTGCAGGCCACCAAG- 3’; Motif 27 Mutated Forward: 5’CTTGGTGGCCTTTAGATCGAGGCAAGCCAG- 3’ and Motif 27 Mutated Reverse: 5’CTGGCTTGCCTCGATCTAAAGGCCACCAAG- 3’. Red color indicates the sites of mutation. 12 Western Blotting Western blotting was performed according to previous works (Terabayashi et al 2007). Protein bands were visualized using ChemiDoc™ XRS+ System with Image Lab™ Software (BioRad, CA). Precision Plus™ Protein marker was used to identify the specific bands of the protein of interest (BioRad, CA). Experiments were performed in three independent experiments. Flow cytometric analysis of cell cycle kinetics Cells were transfected with FoxA2 siRNA in culture plates and grown for 48 hours. Cells were harvested and stained with Propidium Iodide (PI) solution (10% Sodium citrate, 10% Triton-100, 1mg/ml PI, 10mg/ml RNAse A) for one hour. 106 cells were filtered and examined by FACS Canto and DNA histograms were analyzed by FlowJo software (Becton Dickinson, Franklin Lakes, NJ). Experiments were performed in three independent experiments and the results are presented as average percentage of cells in each phase of the cell cycle. Whole Genome RNA Sequencing Ishikawa cell line was cultured in six-well-cultured plates (5 x 105 cells/well) and maintained in its designated medium. Total RNA was extracted from the cell line after 48 hours of culture or transfection. Genome Analyzer GAIIx (Illumina, San Diego, CA) was used for whole genomic RNA sequencing and performed as described previously (Langmead et al). RNA libraries were generated by the modified Illumina protocol using the mRNA sequence preparation kit. Briefly, 1 g of total RNA was enriched for polyA RNA by two successive rounds of oligo(dT) selection. The polyA RNA was then fragmented and first strand cDNA synthesis was performed using random hexamer priming. Following second strand cDNA synthesis, dsDNA was treated using T4 DNA polymerase, Klenow enzyme, 13 and T4 polynucleotide kinase (PNK) (New England Biolabs, Massachussetts, USA), followed by treatment with Klenow exo- to add an A base to the 3’ end. After ligation of the Solexa adaptor using Takara Ligation Mix (Takara, Japan), the adaptor-ligated DNAs were amplified using Solexa PCR primers for 18 cycles, and the amplified library was isolated from an agarose gel. The samples were purified using the QIAquick MinElute Kit (Qiagen, Valencia, CA, USA) at each preparation step. Whole Genome RNA Sequencing Data Analysis For each sample, cDNA was sequenced (single 36 bp read) using the Illumina Genome Analyzer GAIIx. The base-called sequences were obtained using SCS2.7 from RNA sequence image data. To calculate the total amount of the transcripts of each mRNA, a series of programs – Bowtie (Langmead et al 2009), TopHat (Trapnell et al 2010), and Cufflinks (Trapnell et al 2010)- were used. Briefly, RNA sequence reads were mapped against the whole reference genome (hg19) using Bowtie. The reads that did not align to the genome but were mapped to potential splice junctions by TopHat were considered to bridge splice junctions. The quantification of transcripts with normalized gene lengths were performed with Cufflinks. All of the parameters except ‘Max multihits’ (TopHat) were substituted with default options. Statistical Analysis Student’s t test was used to compare the means of two groups followed by F-test. Analyses of Variance (ANOVA) was used to compare the means of three or more groups followed by Bonferroni’s test to correct for multiple comparisons. Immunohistochemistry staining of complex atypical endometrial hyperplasia, G1 and G3 human samples were compared using the Wilcoxon rank-sum test. Benjamini-Hochberg correction for multiple 14 testing was used for the RNA sequencing as described in the previous paper (Trapnell et al 2010). p<0.001 and p<0.05 were considered to be significant as specified in the text. 15 Supplementary References: (Some of the below references are also cited in the main text) Ahn S, Joyner AL (2004). 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Nature 480: 118-122. 18 Details of Antibodies used for immunostaining Antibody Company Catalog No. Dilution -catenin BD transduction 610153 1:1000 Foxa2 (M20) Santa Cruz Biotechnology, INC. sc-6554 1:1500 Cyclin D1 (Clone SP4) Keratin 14 p63 Thermo Scientific RM-9104-S 1:100 Covance Santa Cruz Biotechnology, INC. Cell Signaling PRB-155P sc-8431 1:200 1:200 2230 1:400 Novocastra Laboratories Ltd. Upstate (Millipore) BD transduction Upstate (Millipore) Novocastra Laboratories Ltd. Upstate (Millipore) -- 1:300 06-570 610153 07-633 NCL-Ki67p 06-570 Lef-1 (C12A5) NCL-Ki67p pH3 (Ser10) -catenin Foxa2 Ki67 pH3 (Ser10) 19 Other Kits Used Vectastain ABC kit Vectastain ABC kit, TSA PerkinElmer, INC. Vectastain ABC kit -Vectastain ABC kit Usage Vectastain ABC kit, TSA PerkinElmer, INC. -- IHC 1:300 1:100 1:50 1:100 ---- IHC IF IF IF 1:100 -- IF IHC IHC IHC IHC IHC IHC Details of Antibodies used for Western Blotting Antibody Company Catalog No. Dilution -catenin BD transduction 610153 1:500 Foxa2 (M20) Santa Cruz Biotechnology, INC. sc-6554 1:600 diluted with Toyobo Can Get signal NKB-101 1:1000 diluted with Toyobo Can Get signal NKB-101 1:2000 Cyclin D1 (Clone Thermo Scientific SP4) RM-9104-S -tubulin B-5-1-2) 010M4813 (clone Sigma-Aldrich 20 Detection Reagents Amersham ECL Plus Chemi-LumiOne Nacalai Tesque Amersham ECL Plus Amersham ECL Plus