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Formalin test. A, Time course of the formalin response after intraplantar injection of 10 μl of 5% formalin. B, Cumulative formalin response to the initial phase (0–10 min), early second phase (10–55 min), and late second phase (55–80 min). β2+/+, filled bars or symbols; β2−/−, open bars or symbols. n = 6 per group; ∗p < 0.05. Error bars indicate SEM.
