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Caption

Immunostained proteins SYCP3 (green) and DAZL (red) in embryonic ovaries of a control mouse (left); a mouse with mutant null Aldh1a1, Aldh1a2, and Aldh1a3 alleles (centre); and a mouse with mutant null retinoic acid receptor gene alleles (right). In all three situations, germ cells (red) have entered meiosis, as evidenced by the presence of SYCP3 on meiotic chromosomes (green).

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Anne-Amandine Chassot and Norbert B. Ghyselinck

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