label: Duffy blood group
label_lc: duffy blood group
description: "The Duffy blood group system is based on the presence of a glycoprotein termed Fy that is on the surface of erythrocytes and some other cells. There are two Duffy antigens named Fya and Fyb, and thus there are four Duffy phenotypes: a+b+, a+b-, a-b+,a-b-."