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Objective: To observe the effects of WuziYanzong Pill (WYP) on Cox7a2 gene, Claudin-11 expression and to investigate extracellular signal-regulated kinase (ERK) phosphorylation in rat with kidney essence deficiency syndrome.Methods: Five groups of Sprague-Dawley male rats (5 in each group) were given vehicle, multiglycosides of Tripterygium Wilfordii Hook f (GTW) alone (20mg/kg),or GTW followed by WYP (0.5, 1.0, or 2.0 g/kg daily) respectively for 30 days.Cox7a2 mRNA expression in testis was determined by real-time reverse transcriptase polymerase chain reaction.The extracellular signal-regulated kinase1/2 (ERK1/2) phosphorylation level and Claudin-11 expression were assessed by western blot analysis.