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Receptor proximal assays can include cAMP response measurements, calcium flux assays where applicable, recruitment assays that track pathway engagement, and internalization or trafficking readouts that inform residence and persistence

Check: Vial integrity no cracks, rubber stopper seated, aluminum cap intact Powder appearance pale blue-green cake, NOT pure white (pure white suggests GHK without copper) Labeling batch/lot, milligram content, "GHK-Cu" (not just "GHK"), "for research use only" Cold pack reputable vendors ship with cold packs in warm months Storage Guidelines Key point: Store reconstituted GHK-Cu in a dark corner of your fridge to limit light exposure

doi: 10.1091/mbc.e11-01-0053 92 DominguezERivatCPommierBMauborgneAPohlM