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The first signs of B12 deficiency include persistent fatigue, weakness, lightheadedness, pale skin, tingling or numbness in the hands and feet, difficulty concentrating, and mood changes like irritability or mild depression
Heme and non-heme iron transporters in non-polarized and polarized cells
In hindsight we may have got good results because of a very slight (and accidental!) tweak in how we used it, but one that had big ramifications
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