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The action of Gly-Tyr-NH2,(GY-NH2) and Gly-Tyr-LYS(GYK) on ^125I-LH binding,cAMP accumulation and progesterone production was investigated.Incubation of rat luteal cells for 2.5h with GH-NH2 and GYK at dosage of 0.2mmol/L caused a significant inhibition o