Flow cytometric analysis of patient’s platelets. Analysis was performed on whole blood with MoAbs against GPIIbIIIa (A) GPIb (B), and GPIX (C). As expected with platelets larger than normal there is an increase in surface fluorescence when the patient’s platelets (shaded area) are reacted with the anti-GPIIbIIIa MoAb AP2 compared with a normal control (clear area). There is no detectable GPIb (B) or GPIX (C) on the platelets of the patient (shaded area) compared with a normal control (clear area).