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(1995) Thioredoxin structure and mechanism: conformational changes on oxidation of the active-site sulfhydryls to a disulfide

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B12 and Older Adults While a B12 deficiency isn’t as prevalent as something like vitamin D or folate, evidence suggests that 10-15% of people over the age of 60 are low in B12, likely due to loss of a protein called intrinsic factor, which is essential for the body to absorb vitamin B12