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Expression of DNA damage-related proteins at interimplantation site (D5NI) and implantation site (D5I) in mouse uterus on day 5. A, Western blot of p-ATR, p-CHK1, and p-H2AX. B, real-time RT-PCR of Chk1 mRNA. C, real-time RT-PCR of E2f1 mRNA. *, p < 0.05; error bars, S.E.
