Fig. 2.
Stage-specific suppression of CFU-Meg by TGF-β1. CFU-Meg colony assay was performed with CD34+ cells incubated with TGF-β1 (1.0 ng/mL) in a delayed addition fashion at days 0, 2, 4, 6, 8, 10, 12, and 14 ([▩] presence of TPO in culture medium; [▧] presence of TGF-β1 in the culture medium). CFU-Meg colony assays, without TGF-β1 and with TGF-β1 preincubation for 24 hours, were also performed.