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The aim of this study was to investigate the effect and significance of l‐arginine and ageing on nitric oxide (NO)‐cyclic guanosine monophosphate (cGMP) pathway and ET‐1 in penile tissue of rats. The different months old rats were divided into control group and experiment group randomly, the content of NO, cGMP, the changes of activity of Nitrous Oxide Systems (NOS) and the content of endothelin‐1(ET‐1)...
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