1 Supplementary Table 1. Echocardiographic function of cell-treated vs. saline-treated infarcted hearts at 2 weeks and 6 weeks post-injury. Echocardiographic measurements were made at both the basal (mid-papillary) level and at the apical level. Sample sizes were 11 for cell treatment and 7 for saline treatment. Comparisons were made between cell-treated and control groups using two-tailed Student’s t-test and significant differences (p<0.05) are marked with an *. Abbreviations: EDD, left ventricular end-diastolic diameter; ESD, left ventricular end-systolic diameter; % FS, percent fractional shortening, defined as (EDD-ESD)/EDD. Parameter Location Treatment Group Mean at 2 weeks Mean at 6 weeks EDD Basal Cell-treated 3.78 ± 0.65 mm 4.05 ± 0.44 mm* EDD Basal Saline-treated 4.24 ± 0.76 mm 4.83 ± 1.14 mm* ESD Basal Cell-treated 3.01 ± 0.86 mm 3.21 ± 0.65 mm* ESD Basal Saline-treated 3.38 ± 0.97 mm 4.23 ± 1.31 mm* % FS Basal Cell-treated 21.70 ± 11.92 21.19 ± 9.43 % FS Basal Saline-treated 21.24 ± 8.24 13.08 ± 7.28 EDD Apical Cell-treated 2.60 ± 0.45 mm 2.17 ± 0.20 mm* EDD Apical Saline-treated 3.03 ± 1.27 mm 3.01 ± 0.74 mm* ESD Apical Cell-treated 2.12 ± 0.41 mm 1.63 ± 0.34 mm* ESD Apical Saline-treated 2.37 ± 0.89 mm 2.64 ± 0.88 mm* % FS Apical Cell-treated 15.67 ± 6.80 25.75 ± 10.50* % FS Apical Saline-treated 19.18 ± 13.27 13.87 ± 7.83 * 2 Supplementary Table 2. Hemodynamic parameters of cell-treated and salinetreated infarcted animals 6 weeks after infarction. Comparison is made to sham-operated animals 6 weeks after thoracotomy. Units for SBP, DBP, MAP, and EDLVP are mm Hg. Units for max and min dP/dt are mm Hg s-1. Pairwise comparisons were made using the Student’s t-test with Bonferroni correction for multiple comparisons. There are statistically significant differences between EDLVP, max dP/dt, and min dP/dt between sham-operated animals and infarcted animals (cell-treated or saline treated). Group HR SBP DBP MAP EDLVP max dP/dt min dP/dt Cell-treated 427.8 52.4 86.0 9.8 59.5 4.7 67.5 5.4 7.9 7.1 3735.8 774.7 -3050.0 666.0 Saline 393.5 36.3 88.5 10.3 63.3 6.6 70.8 7.5 7.5 7.3 3240.8 623.6 -2704.8 605.3 Sham 403.1 33.2 94.3 7.2 61.3 6.1 71.2 6.2 0.1 1.9 4462.3 341.9 -4111.0 476.7 3 Supplementary Table 3. Hematopoietic chimerism in parabiotic pairs. Nontransgenic (nonTg) mice underwent coronary artery ligation and were surgically joined to GFP transgenic partners for 8 weeks. Hematopoietic cell chimerism in the blood, spleen, and BM of nontransgenic partners (% GFP + cells) was determined by flow cytometry. Chimerism of BM LT-HSC was determined after staining for c-kit, Thy1.1, lineage markers, and Sca-1. Abbreviations: BM, bone marrow; LT-HSC, long-term reconstituting hematopoietic stem cell. Pair # Blood Spleen BM BM LT-HSC 1 39.6 42.4 10.0 7.4 2 44.4 36.8 5.1 3.4 3 49.6 38.2 7.1 5.7 4 40.3 34.8 4.7 5.7 Average ± SD 43.5 ± 4.6 38.1 ± 3.2 6.7 ± 2.4 5.6 ± 1.6