Transfer of CD55, CD59 and AChE from wildtype to GPI-deficient EL cells was significantly diminished by immune depletion with the corresponding antibody-protein A Sepharose (Figure 9a,e, dark green curve and bar) either alone or in combination (ALL) and, most potently, by adsorption to α-toxin Sepharose. Here, CD55 is linked to acute lymphoblastic leukemia.