Blood was drawn from WT mice (dashed lines), SR-BI KO mice (dotted lines), SR-BI KO mice expressing a primarily liver specific SR-BI transgene (KO-Tg, stippled bars), PDZK1−/− mice (hatched bars), and SR-BI KO/apoE−/− double knockout mice (dKO, gray bars) and plasma unesterified-to-total cholesterol ratios (UC:TC) (panel A, n=7–18), platelet cholesterol contents (panel B, filipin staining, n=7) and platelet counts (panel C, n=7–13) were determined (**P<0.001).