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7 _6 x9 g" K' y4 J! a8 d" h( g第一篇 Retinoic acid regulation of male meiosis.
  `) z% F! Q1 c; E. u$ O' s链接如下：http://www.ncbi.nlm.nih.gov/pubmed/23511242& k; T8 H% ?# B2 Z5 J
第二篇
. z; |+ w/ M4 \1 r. ?  |Function of retinoic acid receptor gamma in the mouse.- h+ j9 J. ?5 h9 X# L& X6 [
链接如下：https://www.ncbi.nlm.nih.gov/pubmed/8388780