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Once a vial has been pierced and drawn from, standard laboratory practice typically allows continued use for up to 28 days, after which the vial should be discarded

[PMC free article: PMC2438237] [PubMed: 18458326] 25

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however, these reactions are further classified by the individual monoamine reactant they describe (i.e., dopaminylation, serotonylation, histaminylation)

Its sequence allows the peptide to remain relatively stable in certain biological environments compared to many other short peptides

That condensation enables hydrolysis and other degradation reactions, potentially ruining a peptide that would have remained stable for years with proper handling