Sensitivity of erythroid precursors to Epo after cessation of erythropoietin therapy.

Sensitivity of marrow erythroid precursors to increasing erythropoietin concentrations in rats sacrificed 0 (white bars), 20 (hatched bars, large bands), or 40 (hatched bars, small bands) days after cessation of treatment with high doses of rHuEpo, compared to control untreated animals (black bars).