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Not unheard of, just rare: https://en.wikipedia.org/wiki/Human_chimera

And worth noting that if all goes well, you'd never know you were chimeric.

A human chimera would not have some cells with a genome from one parent and other cells with a separate genome from the other parent. That's not the way human reproduction or genetics works.

Unheard of. The wikipedia article is about individual flukes not species norms. This was covered in the article.

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