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In humans, small intestinal epithelial cells convert Gln and glutamate to citrulline, which is then transported by the circulatory system to renal proximal tubular cells, where arginine is synthesized by arginine-succinate synthetase and arginine-succinate lyase in the urea cycle

[33] [34] These inactivating factors are furthermore regulated by different Non-coding RNAs: The sRNA NsiR4 interacts with the 5'UTR of the mRNA of the GS inactivating factor IF7 ( gifA mRNA) and reduces its expression

doi:10.1016/j.freeradbiomed.2005.04.020

That evidence gives MK-677 relevance in muscle growth discussions, but it does not make it a simple bodybuilding solution