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After birth, most production is limited to red bone marrow in specific regions, but some white blood cells are produced in lymphoid tissue. All types of formed elements develop from a single cell type -- stem cell (pleuripotential cells or hemocytoblasts).Seven different cell lines, each controlled by a specific growth factor, develop from the hemocytoblast.hen a stem cell divides, one of the daughters remains a stem cell and the other becomes a precursor cell, either a lymphoid cell or a myeloid cell. These cells continue to mature into various blood cells. A leukemia can develop at any point in cell differentiation.
1 Fetal stem cells-These cells are taken from the germline tissues that will make up the gonads of aborted fetuses. 2  Umbilical cord stem cells-Umbilical cord blood contains stem cells similar to those found in bone marrow. Umbilical cord stem cells-Umbilical cord blood contains stem cells similar to those found in bone marrow. 2  Placenta derived stem cells-Up to ten times as many stem cells can be harvested from a placenta as from cord blood. 3  Adult stem cells-Many adult tissues contain stem cells that can be isolated.