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(A) Scatter plots of mean BP duration for individual rats self-administering sucrose during EXT (left) and PR (right). (B) Scatter plots of mean BP duration for individual rats self-administering fentanyl during EXT (left) and PR (right). Dashed line represents parity for FR5 vs. EXT (left) or FR5 vs. PR (right). Individual male data represented by circles; individual female data represented by triangles.
