To be fair, an embryo is not a human. Only when the nervous system has formed (roughly 2 months) can you even consider it as a human, and even then it's not very complex.
Nobody has yet to determine when a fetus becomes human; without which the argument is left to be unspecified for sick people to claim it as 'up until birth'. Stop bitching about killing babies and press doctors to quantitatively determine when 'human' begins.
A blastocyte clearly isn't a human. It has the potential to be a person at some point, but it isn't yet.
I'm also fond of drawing the line at neural activity.
If you deny unborn children's humanity, then other people will be open to denying you yours, which is fine for you, I guess, since it's open to interpretation.
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