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Effect of intensity of suckling on the relative expression of KiSS-1 gene (mean ± SE) in the ARC of lactating rats (n = 4) with 5 pups which were separated from their pups for 6 hr on day 8 postpartum, after which the pups were allowed to suckle their dams for 2.5, 5, or 7.5 min. Control lactating rats were not separated from their pups. a,b,c Different letters indicate significant difference (P< 0.01)
