Expression of pSTAT-3 and pSTAT-5 in E-CFCs isolated from 2 healthy persons (1 and 2), from 2 patients with JAK2 wild-type E-CFCs (3 and 4), and in JAK2^V627F-mutated E-CFCs obtained from 3 patients (5-7). Values are expressed in arbitrary units as the ratio of the densitometric analysis between pSTAT-3 and pSTAT-5 and the respective β-actin bands.