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Vitamin B 12 Deficiency

A nutritional condition produced by a deficiency of VITAMIN B 12 in the diet, characterized by megaloblastic anemia. Since vitamin B 12 is not present in plants, humans have obtained their supply from animal products, from multivitamin supplements in the form of pills, and as additives to food preparations. A wide variety of neuropsychiatric abnormalities is also seen in vitamin B 12 deficiency and appears to be due to an undefined defect involving myelin synthesis. (From Cecil Textbook of Medicine, 19th ed, p848)

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Tree Number(s): C18.654.521.500.133.699.923

MeSH Unique ID: D014806

Entry Terms:

  • Deficiency, Vitamin B 12
  • Deficiency, Vitamin B12
  • Deficiencies, Vitamin B12
  • Vitamin B12 Deficiencies
  • Vitamin B12 Deficiency

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