Defective surface expression of GPI-anchored proteins on Molt4–1D10 and CHOPA10.14 cells. Wild-type Molt4, mutant Molt4–1D10, wild-type CHO-3B2A, and mutant CHOPA-10.14 cells were stained for DAF (top) and CD59 (bottom) and analyzed in a FACScan. Solid lines, specific monoclonal antibodies; dotted lines, isotype-matched control antibodies.