“…D-[l-14C]glucosamine is an excellent precursor for use in the investigation of synthesis of glycoproteins (8). Many investigators have reported the incorporation of '4C-glucosamine into amino sugar nucleotides and glycoproteins in several organs such as the liver (1,8,14), blood plasma (12,14), small intestine (7,18) and skin (5). Robinson et al (14) have also investigated the distribution of radioactivity in various rat tissues after intravenous injection of 14C-glucosamine and the incorporation of 14C-glucosamine into the protein of cytoplasmic fractions 213 GOTO ET AL.…”