Fun fact: even if you've had your DNA sampled, you still don't know that your whole body is XX or XY. You could be an intersex chimera
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And since we don't do that, we have no way of knowing what the true prevalence of human chimerism is
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Chimerism only reveals itself in a minority of cases; those cases (different eye colors, mosaic skin) suggest it's more common than we think
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Fun fact, mothers sometimes take the cells of fetuses into their body, male or female. So they could have parts of them with male DNA.
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Nature is weird and gross and messy and wonderful
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