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Oysters and clams are surpassed only by liver as good sources of Vitamin B 12
The peptide contains an intramolecular disulfide bridge between two cysteine residues, which constrains its three-dimensional structure
" But your experience does not generalize - many people with PA experience returning symptoms although their serum B12 is normal or high
They can take months or years, and complete structural restoration is rare with conservative treatment alone
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