Expression of the Emm antigen vs CD59 in RBCs from IGD patients. Cell surface expression of CD59 (top panel) and the Emm antigen (bottom panel) in RBCs from PIGG (proband 1), PIGA, PIGN, and PIGO patients. The gray profile corresponds to RBCs incubated with only the PE-conjugated anti-mouse (top panel) and anti-human (bottom panel) IgG antibodies.