α‐2‐L‐Fucosyltransferase Activity in Sera of Individuals with H‐Deficient Red Cells and Normal H Antigen in Secretions

Abstract
α‐2‐L‐Fucosyltransferase activity was found in the sera of 4 H‐deficient secretor individuals (Hz). This activity represented about 5–10% of the activity present in the serum of normal H phenotypes.