Face scratching and mechanical head-withdrawal threshold following subcutaneous formalin injection into the whisker pad.

<p>A, B and C: The duration of face scratching events in wild-type, GluR2 delta7 KI and GluR3 delta7 KI mice. Gray lines in A, B and C represent individual animal values and dotted lines indicate mean values. D: Mean face scratching duration after formalin injection was plotted before, and in the 1^st phase (0–15 min) and 2^nd phase (16–60 min) after formalin injection. E: Mean head-withdrawal threshold before and 40 min after formalin injection into the whisker pad skin in in the wild-type, GluR2 delta7 KI and GluR3 delta7 KI mice.