@dirtyoldtown It will never work out till we define a non-arbitrary line... it isnt fertalization, or birth, neither of those make sense as they are arbitrary and doesnt consider when life deserves protection as life.
To me the answer is simple, you can kill clusters of cells that belong to you all you want, you simply shouldnt be allowed to kill human neurons without there being a risk, or if those "neurons" requested death (euthanasia).