Precursor cells {hemopoietic stem cell} (HSC), trapped inside bone-marrow special-cell {stromal cell} pockets, make all immune-system cells.
Hemopoietic stem cells divide to make cells {multipotent progenitor cell} (MPP) that move out of stroma and make hemopoietic stem cells that stay in stroma. Multipotent progenitor cells divide into myeloid progenitors and lymphoid progenitors. Myeloid progenitors divide into granulocytic/monocytic precursors and megakaryocytic/erythrocytic precursors. Lymphoid progenitors divide into B-cell precursors and T-cell precursors.
4-Zoology-Organ-Immune System-Cells
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Date Modified: 2022.0225