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Gonadotrophin-releasing hormone (GnRH) was originally believed to be released by a unique set of hypophysiotrophic neurons to stimulate the release of gonadotrophins from the pituitary, therefore acting as a major initiator of the hormonal cascade controlling the reproductive axis. However, it now appears that each vertebrate species expresses two or three GnRH forms in multiple tissues and that GnRHs...
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