Abstract
Three erythrocyte populations (E, EA, A) were characterized during normal chick development by presence on cells of the embryonic (E) or adult (A) antigen or both (EA). Embryonic and adult stem cells were grafted into irradiated animals in order to distinguish the respective influence of stem cell origin and physiological conditions in the production of antigens. Adult marrow stem cells produce A erythrocytes. Embryonic stem cells (from 6- or 11-day-old embryo yolk sac) give rise first to E, then to EA populations. These results confirm the existence of adult stem cells with their own properties. It was not possible to decide whether the E and EA populations arise from a unique embryonic stem cell or from the existence of two stem cell populations.
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