Biosynthesis of a Blood‐Group‐I Determinant Reacting with Anti‐I Ma Serum (Group 1)

Abstract
A blood-group-I determinant reacting specifically with anti-I Ma serum (group 1) was produced biosynthetically by the action of a .beta.-galactosyl transferase isolated from human milk on a precursor glycoprotein produced by formic acid hydrolysis and [Helix pomatia] .beta.-D-galactosidase action on blood-group H substance prepared from hog gastric mucosa.