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To determine whether decreased testicular levels of enzymes necessary for retinoic acid biosynthesis were associated with male infertility, as retinoic acid is known to be necessary for spermatogenesis.Observational analysis of testicular tissue samples, sperm indices, and serum hormone concentrations.Two infertility centers in Chile.32 infertile men and 11 control men.Measurement of the three enzymes...
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