Hematopoiesis in spleen. Spleen at 1 (Top) and 6 (Bottom) weeks. Spleen appears normal at week 1. Extensive extramedullary hematopoiesis is apparent at week 6 as evidenced by the presence of megakaryocytes (arrow heads). Specimens were obtained from the experiment described in Figure 3.
Tao et al. BMC Cancer 2008 8:228 doi:10.1186/1471-2407-8-228