Nearly 50% of PNH patients and 60% of AA patients have detectable ULBP 1, 2, or 3 on GPI (+) granulocytes, and all evaluated AA and PNH patients had detectable ULBPs on CD34+ hematopoietic progenitors (82, 83). This evidence concerns the gene GPI and paroxysmal nocturnal hemoglobinuria.