Dictionary of Human Evolution and Biology

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Genital Tubercle

External swelling on the mid-line of a developing embryo anterior to the tail that begins about the 6th week of development, and initially consists of sexually indifferent tissues: glans, urethral groove, paired urethral folds, and paired labioscrotal swellings. Dependent upon the absence or presence of an SRY gene, these homologous structures develop into female or male genitalia, respectively.

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