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FAAH deficiency impairs sperm fertility. a) Number of two-cell embryos per plug-positive WT females mated with WT or Faah−/− males. Numbers of plug-positive mice used are shown within the bars (* P < 0.05, unpaired Student t-test). b) Percentage of two-cell embryos and unfertilized eggs retrieved from the same groups. Thirteen mice are used in each group (* P < 0.01, Chi-square test).
