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Mean (± SEM) activity level (wheel-turns per day) in female (filled symbols) and male (open symbols) P (left panels) and HAD (right panels) rats, under either intermittent (top panels) or continuous (bottom panels) ethanol access. Successive 15-day epochs are labeled as either “W” (water-only; W1, W2, etc.) or as “E” (ethanol-access; E1, E2, etc.).
