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doi: 10.1074/jbc.R700051200

Pernicious anaemia, an autoimmune condition where the body cannot produce intrinsic factor, requires lifelong B12 injections

Sayedahmed, E

[DOI] [PubMed] [Google Scholar] 21.Littarru G.P., Langsjoen P

In Parkinsons disease (PD), oxidative stress is closely associated with the degeneration of dopaminergic neurons in the substantia nigra

Although pernicious anemia was once the primary cause, this disorder is now only seen in a few cases, and food-bound cobalamin malabsorption is responsible for vitamin B12 insufficiency [48]
