Overview of the different stem cell compartments and progenitors in the BM. These progenitors can commit to various cell lineages for further differentiation, including erythropoiesis (A), megakaryopoiesis (B), myelopoiesis (C), and monopoiesis (D). The specific differentiation marker panels used for the recognition of individual stages of maturation are indicated. CMP, common myeloid progenitor; GMP, granulocyte/macrophage progenitor; HSC, hematopoietic stem cell; MDP, monocyte/dendritic cell progenitor; MEP, megakaryocyte/erythrocyte progenitor; MPP, multipotent progenitor.