Facilitated progenitor cells' potential in TgR mice. Committed colony-forming units of (A) megakaryocyte (CFU-Mk), (B) granulocytic/monocytic (CFU-GM), and (C) multipotential (CFU-GEMM) progenitors were quantified in a semisolid colony formation assay. Asterisks denote significantly different values. Assays were set up in triplicates from bone marrow preparations (4 mice per time point). Values represent mean ± SD. (+) indicates the time point where quantitation was performed. Asterisks denote significantly different values (P < .05, Student t test).