Ser-9 is conserved in epsilon, delta, theta, and unclassified GSTs and works to stabilize the GSH thiolate through a hydrogen bonding interaction [42, 73, 80, 83, 84, 86]
Yes, it can darken existing moles and freckles and cause new dark spots
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Compared to gold-standard testing, BIA has an average error of around 3 to 5% body fat, large enough to hide meaningful short-term change
The function of glutathione can be complemented by the addition of reducing agents, suggesting that the main role for glutathione is in reduction rather than oxidation