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Image for: Testosterone: a male and a female sex hormone


Researchers have succeeded in breeding chickens without androgen receptor. In these roosters (left), some of the typical external sexual characteristics were underdeveloped compared to roosters with receptors (right).
Researchers have succeeded in breeding chickens without androgen receptor. In these roosters (left), some of the typical external sexual characteristics were underdeveloped compared to roosters with receptors (right).

© MPI for Biological Intelligence / Julia Kuhl

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