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Stability of heroin-vs-food choice pre- and post-fentanyl vaccine administration in rhesus monkeys (n=3). Top ordinate (A): percent heroin choice. Top abscissa: unit heroin dose in milligrams per kilogram per injection. Bottom ordinate (B): choices per session. Bottom abscissa: Reinforcer type. Points and bars in panels B and C represent mean ±SEM.
