Fig. 1
From: N/OFQ modulates orofacial pain induced by tooth movement through CGRP-dependent pathways
Facial expression changes of rats in RGS scoring. a–d Facial expression changes in the context of no pain. e–h Facial expression changes in the context of pain. The RGS scoring was performed based on the facial expression changes in orbit, nose, ear and whisker (indicated by boxes and arrows). Note that the eyes were round, ears were flat, noses were bulged and whiskers showed no tendency of bunching in the context of no pain. In contrast, eyes were squeezed, ears were folded, noses were flattened and whiskers tended to bunch in pain condition