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Description
Different categories of peptides include: Signal peptides Many popular peptides, such as Matrixyl, act as messengers that signal the skin to produce more collagen

In addition, MOR and DOR recycling may be dynamically regulated through receptor phosphorylation [46, 60] and interactions with arrestin1 and arrestin2 [61]

No definitive primary receptor for DSIP has been conclusively characterized

They were split into three groups
