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Protein S -nitrosylation, the covalent attachment of nitric oxide (NO) moiety to the reactive thiol group of a cysteine residue to form S -nitrosothiol is an important PTM for most classes of proteins ( S -nitrosylated proteins such as Bcl-2, p53, HIF-1, PTEN, and Src are involved in cell survival, angiogenesis, tumorigenesis, and response to cancer treatment (68)

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PLoS Genet (2015) 11(3):e1005067

This article explains how these injections work, their benefits and risks, and how they compare to taking B12 in pill form

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