20 AMINO ACIDS Cysteine Polar but Uncharged R Group 2. Tyrosine 3. 4. Glutamic Acid/Glutamate Proline 5. Aspartic Acid 6. Serine Polar but Uncharged R Group Negatively Charged R Groups Nonpolar (Hydrophobic) R group Negatively Charged R Groups Polar but Uncharged R Group 7. Glycine 8. Alanine 9. Glutamine Amino Acids produced by the body 1. Commonly Recognized Amino Acid Polar but Uncharged R Group Nonpolar (Hydrophobic) R group Polar but Uncharged R Group Commonly Recognized Amino Acid 10. Asparagine 11. Valine 13. Arginine 14. Lysine 15. Threonine 16. Leucine 17. Isoleucine 18. Methionine 19. Histidine 20. Tryptophan Amino Acids that the body cannot produced but are needed 12. Phenylalanine Commonly Recognized Amino Acid Commonly Recognized Amino Acid Essential Amino Acids Essential Amino Acids Other Amino Acids Other Amino Acids Other Amino Acids Other Amino Acids Other Amino Acids Commonly Recognized Amino Acid Essential Amino Acids Polar but Uncharged R Group Nonpolar (Hydrophobic) R group Nonpolar (Hydrophobic) R group Positively Charged R Groups Positively Charged R Groups Polar but Uncharged R Group Nonpolar (Hydrophobic) R group Nonpolar (Hydrophobic) R group Nonpolar (Hydrophobic) R group Positively Charged R Groups Nonpolar (Hydrophobic) R group NEUTRAL AMINO ACIDS Name Symbol Glycine Gly Formula Neutral SulfurContaining Amino Acids (Cystine) Neutral Aromatic Amino Acids Acidic Amino Acids Imino Amino Acids (Hydroxyproline) Acidic Amino Acids Neutral Aliphatic Straight Chain Neutral Aliphatic Straight Chain Neutral Aliphatic Straight Chain Neutral Aliphatic Branched Chain Neutral Aromatic Amino Acids Basic Amino Acids Basic Amino Acids Neutral Aliphatic Straight Chain Neutral Aliphatic Branched Chain Neutral Aliphatic Branched Chain Neutral SulfurContaining Amino Acids Basic Amino Acids Neutral Aromatic Amino Acids Alanine Ala Valine Val Leucine Leu Isoleucine Ileu or Ile Serine Ser Threonine Thr Name Symbol Phenylalanine Phe Methionine Met NEUTRAL AMINO ACIDS Formula Cysteine Cys Tryptophan Trp Proline Pro Name Symbol Aspartic Asp Glutamic Glu Name Symbol Lysine Lys Histidine His ACIDIC AMINO ACIDS Formula BASIC AMINO ACIDS Name Symbol Arginine Arg Formula OTHER AMINO ACIDS Classification Basic Formula Asparagine Asn Glutamine Gln Tyrosine Tyr Neutral (SulfurContaining) Cystine Hydroxyproline Neutral (Aromatic) Hyp Imino