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We postulate that L-arginine in the penis may be a substrate-limiting factor for NOS activity [NOS = nitric oxide synthase, the enzyme responsible for metabolizing nitric oxide from L-arginine - ed.] and that L-arginine may up-regulate penile NOS activity but not its expression.
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http://www.asiatour.com/deutsch-thai/griesgramig.htm
Jan Garanoz
Last updated: November 16, 2011
