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Stem cells are undifferentiated (immature) cells found in many species of multicellular organisms. Stem cells are able to self-renew, forming new stem cells, divide through mitosis and differentiate into specialized cells, that is, turn into cells of various organs and tissues. Stem cell division and differentiation A: stem cells; B: progenitor cell; C: differentiated cell; 1: symmetric stem cell division; 2: asymmetric stem cell division; 3: progenitor division; 4: terminal I have now found that these primitive blood cells, as I call them, are in no way erythroblasts, as it should be generally accepted, but completely undifferentiated elements with a round light nucleus and a narrow basophilic protoplasm; they are neither red nor white blood cells, although most likely they could still be called white blood cells, since they sometimes, especially in chickens, have an ameboid shape and are very similar to large lymphocytes. They further multiply, and at first their number increases by replacing endothelial cells in primitive vessels
