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A single dose of Myleran suppressed CFU in polycythemic mice to around 1% of normal for a period of 2 weeks and permitted the study of effects of erythropoietin on unipotential, erythroid stem cells (erythropoietin‐responsive cells, ERC) in the absence of cell inflow from the CFU compartment. Without erythropoietin no ERC were detectable for 12 days after Myleran. Injections of erythropoietin had no effect on CFU but restored ERC populations in proportion to the dose of erythropoietin. Hydroxyurea given after erythropoietin markedly inhibited ERC repopulation and the latter is attributed to a stimulation of ERC proliferation by erythropoietin. Evidence in support of an age structure in the ERC population is presented. Daily erythropoietin injection resulted in stable ERC populations, indicating that ERC loss through differentiation and ERC self‐replication were in balance.
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Reißmann et al. (1972) studied this question.
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