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Subsequent advances in chemistry and automation during the 1980s and 1990s made peptide synthesis routine, Kates said, which in turn allowed researchers to produce them far more efficiently

Each 2mg injection contributes approximately 0.03mg copper, compared to 0.9-2.2mg from typical daily diet

These include the bell-shaped dose-response curve, central effects after peripheral administration, a delayed and prolonged time course, and some penetration of the blood-brain barrier in essentially intact form

Many peptides described here are research compounds that are not FDA-approved for the uses discussed and may be investigational or restricted