Morphology of BMSCs from WT and TTP-deficient mice.

BMSCs were cultured for 6 weeks as described in “Materials and Methods.” After this period, the cells were trypsinized and replated at 50 000 cells/well in 4-well Lab-Tek tissue-culture chambers. After incubation for 48 hours, the slides were stained with the Diff-Qick Stain Set and photographed under light microscopy (60 × magnification). (A) WT cells. (B) TTP-deficient cells. Arrows indicate fibroblastlike cells, and arrowheads indicate macrophagelike cells.