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The copper is held by the imidazole nitrogen of the histidine side chain, the alpha-amino nitrogen of the glycine, and the deprotonated amide nitrogen between glycine and histidine, with the lysine side chain and neighboring molecules contributing additional interactions

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NPJ Parkinsons Dis 7:21 Fernandez-Pajarin G, Sesar A, Ares B, Castro A (2016) Evaluating the efficacy of nocturnal continuous subcutaneous apomorphine infusion in sleep disorders in advanced Parkinsons disease: the APO-NIGHT STudy

On a more encouraging note, U.S

Step 7: Test pH Use pH strips to check acidity