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In page Beginning of human personhood:

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Philosophers such as Aquinas use the concept of individuation. They say abortion is not permissible from the point at which individual human identity is realized.[citation needed] According to Anthony Kenny, this can be derived from everyday beliefs and language, and one can say: "if my mother had an abortion six months into her pregnancy, she would have killed me", then one can reasonably infer at six months, the me in question would have been an existing person with a valid claim to life. Because division of the zygote into twins through the process of monozygotic twinning can occur until the fourteenth day of pregnancy, Kenny says individual identity is obtained at this point and thus abortion is not permissible after two weeks.[1]