Colonies formation of hematopoietic stem cells treated with emodin. CFU-E (colony forming unit-erythroid), BFU-E (burst forming unit-erythroid), CFU-GM (colony forming unit-granulocyte, macrophage), CFU-GEMM (colony forming unit-granulocyte, erythrocyte, macrophage, megakaryocyte). (a) CFU-E after 3-day incubation. (b) BFU-E and CFU-GM after 6-day incubation. (c) BFU-E and CFU-GM after 10-day incubation. (d) CFU-Mix after 13-day incubation.