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Hydrin 1′ is found in the neurohypophysis of Xenopus. Hydrin 1′ possesses a considerable steroid-releasing activity in Xenopus adrenal gland in vitro. Hydrin 1′ targets oxytocin receptor and derives a fluorescent probe of the oxytocin receptor[1][2].

[1] Eggena P, et al. A fluorescent analogue of hydrin 1: a new probe for vasotocin receptors[J]. American Journal of Physiology-Endocrinology and Metabolism, 1990, 259(4): E524-E528.
[2] Okada R, et al. Arginine vasotocin is the major adrenocorticotropic hormone-releasing factor in the bullfrog Rana catesbeiana. Gen Comp Endocrinol. 2016 Oct 1;237:121-130. DOI:10.1016/j.ygcen.2016.08.014