Developmental anemia in Stat5a^−/−5b^−/−mice.

Hematocrit measurement on Stat5a^−/−5b^−/−, Stat5a^+/−5b^+/− or wild-type littermates at the ages indicated. The same hematocrit data are tabulated in Table 1. Some of the embryo hematocrit data were published previously.11