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The large amount doesn't pose a danger because people with pernicious anemia absorb only a small fraction of it

doi: 10.7759/cureus.86080 32 BaethgeCGoldbeck-WoodSMertensS

Likewise, a further study suggested that NNMT enhances chemoresistance to 5-FU (5-fluorouracil) in colorectal cancer cells

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