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To confirm that only proteins susceptible to glutathionylation were detected using this method, TNF was used as a negative control as it was not detected in any of the redox arrays, but does contain 4 cysteines

And this study was the longest

A neurologist said my B-12 was normal at 385 but I insisted that was too low based on my own research

B12 injections are advised for those with severe deficiency and/or impaired absorption due to pernicious anemia or surgery