J Nutr Environ Med. 2007 Sep;16(3-4):212-226. doi: 10.1080/13590840701791863. Epub 2008 Jan 10.
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The return of the Scarlet Pimpernel: cobalamin in inflammation II - cobalamins can both selectively promote all three nitric oxide synthases (NOS), particularly iNOS and eNOS, and, as needed, selectively inhibit iNOS and nNOS.