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B12 is only found in animal products (meat, eggs, shellfish, dairy), making deficiency especially common among vegans and vegetarians
Xu Q, Chiao P, Sun Y (2016) Amphiregulin in cancer: new insights for translational medicine
Hepatology (2014) 59:898910
SAM, SAH, and Methylation-Balance Considerations NNMT uses SAM as a methyl donor and generates SAH, so NNMT activity is directly connected to the balance between methyl-donor availability and methylation-product accumulation
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