Altered bone marrow Dnm2fl/flPf4-Cre MK ultrastructure. Transmission electron microscopy analysis of bone marrow Dnm2fl/fl MKs (A) and Dnm2fl/flPf4-Cre MKs (B-D). Areas within boxes in panels A1 and B1 are shown at higher magnification in panels A2 and B2, respectively. Arrowheads point to clathrin-coated vesicles. Bars represent 2 µm.