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"We assumed that all fertile females are XX. However, we now have proof that fertile XY females exist -- and we have no idea how rare or common it is, because it's not something we usually test for." twitter.com/FierceMum/status/1

ncbi.nlm.nih.gov/pmc/articles/

via plus.google.com/+DavidFormosa/

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Toot.Cat

On the internet, everyone knows you're a cat — and that's totally okay.