DEAE-cellulose chromatography and pepsin or trypsin digestion of lime-processed Indian bone gelatins effectively separated the turbidity-producing proteinous material. Amino acid analysis showed that it is a complex of gelatin, glycoprotein (s) (mucoprotein) and non-protein components, and that the glycoprotein (s) is rich in aspartic and glutamic acids and leucine, as reported previously by Leach. Furthermore, two cross-linking amino acids, lysinoalanine and histidinoalanine, were found to be present in high contents.