Abstract
The Cad antigen is a rare erythrocyte blood group antigen expressed on both sialoglycoprotein
and ganglioside structures. It is related both serologically and biochemically to the Sd' blood group antigen
expressed on over 90% of Caucasian erythrocytes. We reported previously that Cad erythrocytes contain
a novel ganglioside that binds Helix pomatia lectin and
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