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Vitamin B12 is a water-soluble vitamin, meaning excess amounts are generally excreted through urine rather than accumulating in the body to cause adverse gastrointestinal effects

"Multienzyme deep learning models improve peptide de novo sequencing by mass spectrometry proteomics." PLoS Computational Biology 19.1 (2023): e1010457

LifeTein provides Cys containing peptides as monomers unless specified otherwise

Chapman LE, Darling AL, Brown JE (2015) The association between the biguanide drug metformin and vitamin B 12 deficiency in diabetic patients: a systematic review