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For dose-response studies or protocols requiring sub-milligram precision, third-party CoA verification showing actual peptide content per vial is non-negotiable

Dark blue, brown, or yellow discoloration indicates oxidation

In contrast, in AMYRs bound to rAmy 15 or the pramlintide analogue, San385 16 , an Asn at the equivalent peptide position (N14 rAmy ) adopts an upward rotamer that is exposed to the solvent environment and forms a H-bond with the backbone of L291 ECL2 (Fig

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