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recently as the 18th century, the prevailing notion in western human embryology was preformation: the idea that a sperm cell itself contains an embryoa preformed, miniature infant, or homunculuswhich simply becomes larger as it develops. The use of the terms has evolved over time. According to, Theories in early embryology: close connections between epigenesis, preformationism, and self-organization, by Speybroeck et. al., " The evolution of the term epigenesis is situated in the context of early embryological

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