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NOT-OD-15-102: Consideration of Sex as a Biological Variable in

This notice focuses on NIH's expectation that scientists will account for the possible role of sex as a biological variable in vertebrate animal 

Polyploidy in Animals: Effects of Gene Expression on Sex

Polyploidization may upset the expression balance of genes in XX females and XY males beyond what can be tolerated. Although this process 

The evolution of same-sex sexual behaviour in mammals | Nature

Same-sex sexual behaviour, that is, any attempted sexual activity between members of the same sex, has been reported in over 1500 animal species 

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Animal Sex: How Dragonflies and Damselflies Do It | Live Science

From here, the pair can fly around together in tandem. If the female is sexually receptive, she will lift her abdomen up to bring her "vagina" 

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Animal Fuck XXX Zoophilia Porn Animal Zoo Sex Zoo Mobile Porn Zoo Porn Animal ZooYouPorn · 7:14 dog fucks بالإصبع و اللعين مع Zoofilia أمي الإباحية5:28 

Policy: NIH to balance sex in cell and animal studies

Janine A. Clayton and Francis S. Collins unveil policies to ensure that preclinical research funded by the US National Institutes of Health 

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Same-sex sexual behavior and evolution

Same-sex sexual behavior has been extensively documented in non-human animals. Here we review the contexts in which it has been studied, focusing on case