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Sperm cells carrying the mutation for Apert syndrome—an abnormal formation of the skull, fingers, and toes—are unusually common, scientists theorized, because the cells that make such mutant sperm are unusually selfish and competitive.

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Sperm cells carrying the mutation for Apert syndrome—an abnormal formation of the skull, fingers, and toes—are unusually common, scientists theorized, because the cells that make such mutant sperm are unusually selfish and competitive.

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