Fig. 2.
Mitogenic response mediated by c-mpl mutants. The mitogenic response was measured by [3H] thymidine incorporation and is shown as a percentage of the maximal GM-CSF–induced response. The mean of triplicate counts for each data point is shown. Standard deviations are indicated by error bars. (A) The mitogenic response of UT-mplwt, UT-mpl▵7, UT-mpl▵7▵C, and UT-mpl▵8 cells and parental UT-7 cells was measured at different TPO concentrations. (B) Comparison of the maximal response of UT-mplwt (▪) and UT-mpl▵7 (□) to GM-CSF (1 ng/mL), IL-3 (2.5 ng/mL), Epo (2.5 U/mL), and TPO (12.5 ng/mL).