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Restriction enzymes perform double stranded breaks at specific sequences, enabling the insertion of a fragment into another, such as an expression plasmid

Many ordinary peptidases do not cleave it efficiently, while specialised gamma-glutamyl enzymes participate in its extracellular metabolism

It activates melanocortin receptors in the brain, which regulate sexual arousal and behavior

It accelerates the healing of tendons, ligaments, and muscle tears by increasing blood flow (angiogenesis) to the injured site

It occurs due to aging, environmental pollution, exposure to tobacco smoke, alcohol, UV radiation, and dozens of other small factors that add up over time