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V., & Pertsovsky, V

Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-l-histidyl-l-lysine-Cu2+

doi: 10.1254/jphs.fp0072161

If air bubbles enter the syringe, it means you've stuck the needle all the way through the pinched skin and have drawn in air from the room

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