Heard about this on Radiolab yesterday... very interesting.
Basically, twin zygotes are created, but somehow fuse back together, forming into one (like Voltron!), which then has two sets of DNA, with one or the other assuming command duty depending on cell type. So the liver might have one, blood having the other, etc.
So, if we aborted one zygote before the merge, would that be "taking a life"?
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