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Different copper peptide variants work better through different administration routes

10.1038/nature13148 154 MaoC.LiuX.ZhangY.LeiG.YanY.LeeH.et al

However, non-specific binding can occur, requiring optimized imidazole elution gradients

Cheap unbranded vials of unknown origin can cause severe allergic reactions, including Stevens-Johnson syndrome (a rare but serious skin reaction)