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Positive sexual imprinting is a process by which individuals use the phenotype of their opposite-sex parent as a template for acquiring mates. Recent studies in humans have concluded that an imprinting-like mechanism influences human mate choice in facial traits.
Most publishers and style guides instruct authors not to use italics for such phrases. Both Springer and Elsevier, for example, insist on setting "in vitro," "in vivo," and "in situ" in normal, or Roman, font, and so does the Chicago Manual of Style and Scientific Style and Format.
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