Inhibition of dynamin in MK cultures. (A) Representative phase-contrast photomicrographs from the 2 treatments shown. DMSO was used at 0.3% final, DynaSore at 100μM final (taken with a 20× objective). Bar represents 50 μm. (B) The proportion of murine MK developing pro-PLTs after 4 days culture of fetal liver cells, quantified as stated in “Methods.”