myelopoiesis trait Any measurable or observable characteristic related to the formation of myeloid cells from the pluripotent hematopoietic stem cells in the bone marrow via myeloid stem cells, including the production of leukocytes in blood, such as monocytes and granulocytes, and precursor cells for macrophages and dendritic cells found in the lymphoid tissue. Trait.ontology VT:0001601 myeloid cell development trait myeloid cell differentiation leukopoiesis trait