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& Yu, C
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M., Nerobkova, L

[DOI] [PubMed] [Google Scholar] 12.Lower proportions of CD4+CD25(high) and CD4+FoxP3, but not CD4+CD25+CD127(low) FoxP3+ T cell levels in children with autoimmune thyroid diseases

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That all indicates to me that if you reach a B12 intake level that gives you coloured wee...you just scale back a bit
