Induction of erythropoietic mRNAs in mice lacking PHD2. Real-time RT-PCR analysis for indicated mRNAs in erythroid lineage cells (A), kidneys (B), and small intestines (C) from 12-week-old PHD2 flox/flox;Cre-ER (−) and PHD2 flox/flox;Cre-ER (+) mice after treatment with tamoxifen at E17.5 and at 3 weeks of age. *P < .05; **P < .01. Error bars indicate 1 SD.