The hematopoietic hierarchy and phenotypic markers associated with HSCs. The LSK compartment contains LT-HSCs, ST-HSCs, and MPPs, each subpopulation of which is associated with distinct phenotypic features as indicated. CLP indicates common lymphoid progenitor; CMP, common myeloid progenitor; GMP, granulocyte/macrophage progenitor; and MEP, megakaryocyte/erythrocyte progenitor.