Practice question

Adult stem cells are identified in many regenerative tissues including bone marrow hematopoietic and mesenchymal compartments, intestinal crypts, hair follicle bulge, basal epidermis, liver oval cells, satellite cells of muscle, and subventricular zone of brain. They require vascular support, stromal signals, and basement membrane attachment for survival. Mature erythrocytes are highly specialized, enucleated, organelle-free cells lacking DNA, transcriptional capacity, and mitotic machinery. Therefore they cannot house self-renewing reserve, de-differentiate, or contribute to regeneration, distinguishing terminal differentiation from stem cell reservoirs essential for homeostasis.