These cells, however, are not T cells. The lineage of the NK cell is not well understood. The myeloid stem cell develops into platelets, red blood cells or the granulocyte-monocyte line. Monocytic cells include monocytes and macrophages. The granulocytes include neutrophils, eosinophils, mast cells and basophils.
Monocytes circulate in the blood and lymphatics but become macrophages when they enter the tissues.
The development of these cells from a stem cell involves cytokine growth factors and the development of a progenitor cell in each line. The progenitor cell is a committed cell, meaning that it is committed to that line of cell growth. In adults, the hematopoeitic cells grow and mature supported by the bone marrow stromal cells. Ask Dr. Lee .