Figure 3b: BM sections from (a) control subject and (b) patient with AML immunohistochemically stained with antihuman thrombomodulin antibodies (magnification, x400). In b, note the increased MVD, as represented by the BM hypercellularity in association with multiple collapsed endothelial cell sprouts (arrowheads). There are fewer vessels in a, however, and the vessels are well differentiated.