Figure 1. Hematopoietic waves in Drosophila. Timeline of hematopoietic waves in the Drosophila embryo and larva. Embryonic and lymph gland hematopoiesis are based on the de novo generation of blood cells, while larval hematopoiesis is founded by embryonic hemocytes that colonize hematopoietic pockets of the larval body wall. Vertical hatching indicates release of hemocytes from hematopoietic sites. Note progressive release of larval hemocytes into circulation over the course of larval development. HM, embryonic head mesoderm; HP, larval hematopoietic pockets; LG, lymph gland.