Spontaneous intersexuality in an adult rat, thought to be genetically male, has beendescribed. Both male and female primordia developed concurrently and most components ofeach were retained with normal adult characteristics. Gonadal and hypophyseal hormones in this specimen stimulated ductal and lobulo‐alveolar proliferation simulating that of the mammary gland during lactation.
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Maibenco et al. (1963) studied this question.
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