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Common B12 deficiency symptoms include fatigue, anxiety, depression, poor memory, confusion, brain fog, tingling or numbness in the extremities, zings or zapping feelings in the extremities, anemia, shortness of breath, muscle weakness, irritability, tender calves, pale complexion and more
The protein concentration of the samples was measured by BCA protein assay
10.1016/0076-6879(95)52005-8 Methods Enzymol
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