Hematocrit and reticulocyte counts in wild-type and GATA-1^low mice during the EPO-induced polycythemia.

(A) (B) Hematocrit (panel A) and reticulocyte counts (in percentage of total red cells) (panel B) in the blood of wild-type (closed circles) and GATA-1^low (open triangles) mice. Polycythemia was induced with 5 consecutive EPO intraperitoneal injections, as indicated by the arrows. The day of the first EPO injection was considered to be day 0. The results are presented as the mean ( ± SD) of the values observed in 12 wild-type and 8 GATA-1^low mice. Values are statistically different. *P < .05. §P < .01.