endogalactosaminidase activity chondroitin hydrolase activity ai GO:0052757 chondroitin endo-beta-galactosaminidase activity 2011-09-28T10:31:53Z Catalysis of the hydrolysis of hexosaminic linkages in chondroitin, a linear polymer structure composed of the repeating disaccharide unit [->4)-D-glucuronic acid-(1->3)-N-acetyl-D-galactosamine-(1-], also written as [->4GlcUA1->3GalNAc1-]. molecular_function