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Years ago, I started taking a vitamin B12 supplement
Since fundamental biochemical pathways evolved in the absence of molecular oxygen, most intracellular disulfides are rather transient and most cysteinyl residues are kept in a reduced state with the help of the thioredoxin or the glutathione/glutaredoxin system 7,63,77
Upon colonization, probiotics directly modulate the gut microbiota and produce active substances to combat infection
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