gal beta 1 -- -- 4glcnac-r + udp-gal ( alpha 1 -- -- 3-galactosyltransferase ) -- -- gal alpha 1 -- -- 3gal beta 1 -- -- 4glcnac-r + udp this enzyme , which participates in the glycosylation of cell membrane glycoconjugates in nonprimate mammals , prosimians , and new world monkeys , appears to have been suppressed in old world primates as a result of evolutionary events which occurred 20-30 million years ago .
C0016964
galactosyltransferase
C0017982
cell membrane