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This condition is caused by low levels of MTHFR enzymes in the body due to impaired functioning of the MTHFR gene
B12 is Found Naturally in Animal Products Vitamin B12 is produced almost exclusively by bacteria and is concentrated in animal foods: beef and lamb (highest density), fish and shellfish (especially salmon, trout, clams), dairy, and eggs
Accessed April 30, 2021
script in Supplementary Materials Scripts .zip file, BLASTn Query) search 35,36
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