Flow cytometric analysis of c-Mpl and GPIIb/IIIa expression on the platelets from 14 ET patients (P1 to P14), one CML patient (CML), and four normal controls (C1 to C4). The expression levels of c-Mpl and GPIIb/IIIa was examined by staining with rabbit anti–c-Mpl antiserum and AP2 MoAb, respectively (solid). The log fluorescence intensity was examined by reference to nonspecific isotype control MoAb (open).