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Additionally, it can be caused by either a lack of B12 in the diet, gastritis, pernicious anemia, digestive diseases (e.g., Crohn's disease and celiac disease), surgery on the GI tract, alcohol use disorder, transcobalamin II deficiency, or Sjgren's syndrome [9]

The observed activities were normalized over the total protein content estimated through Quick Start Bradford reagent (Bio-Rad)

Y., Huang, I
