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Studies using MSR gene inactivation in mice have also shown that methionine sulfoxide reduction is implicated in the regulation of the methionine cycle (reviewed in 28)

Hair-graying and melanocyte stem cells make up the models we use to study this process. Hair pigmentation over the course of a lifetime is dependent on the presence of melanocyte stem cells that reside in the hair follicle

Niksarli says, well, not exactly

And there was a study a few months ago that, it was just like a one day study, but it showed that blasting people in the chest with red light improved their eyesight when it was measured the next day