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They have a high affinity for inactive B12 analogues, although it is believed that this may also play a role in their elimination, as well as other functions that are still being studied and are largely unknown (including the transport of stored B12)

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Aging-related changes in the nigral angiotensin system enhances proinflammatory and pro-oxidative markers and 6-OHDA-induced dopaminergic degeneration

PubMed Bock-Marquette, I., Saxena, A., White, M.D., Dimaio, J.M., & Srivastava, D