Fig. 4.  Hyperalgesia after lateral paw incision (LPI) is greater at the lateral and the central test areas than at the medial test area (see fig. 1 inset for test locations). Loss of response during the first 6 h postincision is because of Xybrex blockade of the ipsilateral sciatic nerve (see tables 3 and 6for significance data). VFH = von Frey hair.