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Mammalian sperm must undergo a series of biochemical and physiological modifications, collectively called capacitation, in the female reproductive tract prior to the acrosome reaction AR. In the present review, we summarize some of the signaling events that are involved in capacitation. The activation of PKA during capacitation depends mainly on cyclic adenosine monophosphate cAMP produced by the bicarbonate-dependent soluble adenylyl cyclase.

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Espinosa, G. Troncoso, S. Ho, M.

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January 31, When females mate with more than one male, each one's sperm has to compete to get to her eggs. Until now, researchers had thought the fastest sperm would dominate.

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He was Nilsson fused artistic and scientific virtuosity to blaze a new frontier in photography, especially within the womb. He transformed himself into a daring explorer, leading viewers of his images — in books, magazines and television documentaries — on fascinating journeys deep inside the human body.

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