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Melatonin increased citrate through up-regulating ZIP-1 in osteoblasts. (A) polymerase chain reaction results of ZIP-1 knockdown and overexpression, (B) western blotting results of ZIP-1 (34 kDa) knockdown and overexpression, (C) relative expression value of ZIP-1, and (D) citrate content in osteoblasts, *P-value < 0.05, **P-value < 0.01.
