Figure 7. Time course of licking responses in PND82 male (A) and female (B) rats in response to an injection of 1.25%, 1.75%, and 2.25% formalin into the plantar surface of the right hindpaw.

Baseline is the time prior to formalin injection (10 min). Data are presented as mean +/− SE. * p<.05, **p<.01, against other groups at the same time point.