The absence of alpha-keto acids in polymeric collagen.
D000085:Acetates; D000409:Alanine; D000818:Animals; D002417:Cattle; D055598:Chemical Phenomena; D002621:Chemistry; D003094:Collagen / Q000032:analysis*; D003956:Dialysis; D007651:Keto Acids / Q000032:analysis*; D010447:Peptide Hydrolases; D010455:Peptides / Q000032:analysis; D010659:Phenylhydrazines; D011108:Polymers; D011773:Pyruvates; D012867:Skin / Q000032:analysis* / Q000196:embryology; D012995:Solubility
D000085:Acetates; D007651:Keto Acids; D010455:Peptides; D010659:Phenylhydrazines; D011108:Polymers; D011773:Pyruvates; D003094:Collagen; D010447:Peptide Hydrolases; D000409:Alanine