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Gonadotropin-releasing hormone (GnRH) controls reproductive functions in vertebrates. In the present study, two distinct homologues (Ci-GnRHR1 and Ci-GnRHR2) of the vertebrate GnRH receptor (GnRHR) were identified by cDNA cloning from the neural complex of the ascidian Ciona intestinalis. The Ci-GnRHR1 and Ci-GnRHR2 genes are closely linked to each other and form a cluster with another GnRHR-like...