| ChemSpiderID = 730 | PubChem = 750 | SMILES = NCC(O)=O }} | Section2 = | Section3 = }} Glycine (abbreviated as Gly or G)'s the organic compound with the formula NH2CH2COOH. It's the smallest of the 20 amino acids commonly found in proteins, coded by codons GGU, GGC, GGA and GGG. Glycine's unique among the proteinogenic amino acids in that it isn't chiral. Most proteins incorporate only small quantities of glycine. A notable exception's collagen, which contains about 35% glycine. Solid glycine… (More on Glycine)