Where people worry is when you get to the brain, the germ cells and the sentinel features that help people recognize what is a person, as opposed to … - Martin Bobrow

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Where people worry is when you get to the brain, the germ cells and the sentinel features that help people recognize what is a person, as opposed to a rat or a rabbit. Things like skin texture, facial shape, speech, replacing brain cells with human cells, allowing the development of human germ cells in animals. And particularly where there is any possibility of fertilisation within an animal.