求助文献3篇，谢谢

fantafiction

Recent advances on in vitro culture and cloning of ungulate embryos., z% }3 @6 N$ n1 S  a9 _
Campbell, K., and Wilmut, I. (1994).
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Improved development to blastocyst of ovine nuclear transfer embryos reconstructed during the presumptive S-phase of enucleated activated oocytes  D- k0 j* M  @2 j/ g, A
Campbell, K.H., Loi, P., Cappai, P., and Wilmut, I. (1994)
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% @5 ?- n1 k6 I  O+ kFate of chromatin in nuclear transfer embryos reconstructed using unactivated oocytes as cytoplast recipients5 V+ Y8 n5 i5 \4 }0 \
Campbell, K.H.S, Ritchie, W.A., and Wilmut, I. (1994)
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第2 个。。