Western blot of the multimeric pattern of vWF R834Q after incubation with plasma from patients suffering from BMT-associated TTP. C1, plasma from a healthy donor incubated with vWF R834Q. C2, plasma from a healthy donor incubated with vWF R834Q in the presence of EDTA (1 mmol/L). Lanes 6 through 13, patient plasmas (numbers as in Table1).