Blood-forming stem cells follow one of two different development pathways, or cell lines -- the lymphoid or the myeloid.
The myeloid cell line begins with a myeloblast. As the myeloblasts reproduce and become more specialized or mature, they will eventually develop into functional blood cells, including:
It is the myeloid cell line that is affected in cancers such as acute myelogenous leukemia (AML) and chronic myelogenous leukemia (CML). Cells of the myeloid line make up about 85% of marrow cells.
Williams, L. "Comprehensive Review of Hematopoiesis and Immunology: Implications for Hematopoietic Stem Cell Transplant Recipients" in Ezzone, S. (2004) Hematopoietic Stem Cell Transplantation: A Manual for Nursing Practice Oncology Nursing Society: Pittsburgh, PA (pp.1- 12)