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Nettie Stevens discovered XY sex chromosomes. She did not get credit because she had two X’s.

Nettie Stevens discovered XY sex chromosomes. She did not get credit because she had two X’s. In the change regarding the twentieth century, biologist Nettie Stevens ended up being driven to fix a clinical secret which had perplexed mankind for millennia. The secret was therefore easy but daunting: Why do men be boys and girls become girls? In her own …

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