ETS2 and ERG promote CFU-Mk formation from wild-type but not Gata1-knockdown progenitors. (A) The number of megakaryocyte colonies generated by GFP⁺ wild-type fetal liver progenitors transduced with MIGR1, MIGR1-ETS2, or MIGR1-ERG. * P less than .05. (B) The number of megakaryocyte colonies generated by GFP⁺Gata1-knockdown fetal liver progenitors transduced with MIGR1, MIGR1-ETS2, or MIGR1-ERG. Note that none of the differences are statistically significant.