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That produces a characteristic doublet separated by two mass units with an approximately two-to-one intensity ratio, which is unmistakable against the ordinary isotope envelope of a small peptide and is one of the few unambiguous confirmations that the metal is present in the ionized species
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Liu C, Cao M, Yang N, Reid-Adam J, Tversky J, Zhan J, et al
Continue Reading How long does a B12 shot last and stay in your system
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