This study aimed to find out if the number of clinically overt vasoocclusive events in SCD is associated with plasma concentration of fucosyltransferase 7 (FUT7), which catalyses the synthesis of sialyl Lewis x (sLex) tetrasaccharide, the core carbohydrate moiety in some ligands for human selectins.24-26. This evidence concerns the gene FUT7 and Schnyder corneal dystrophy.