CGRP stimulates increased P-ERK expression in trigeminal ganglia neurons and satellite glia. Sections of the posterolateral portion of the ganglion (V3) were obtained from untreated animals (CON), or animals injected with CGRP in each TMJ capsule. (A) Images of neuron-satellite glial regions stained for P-ERK are shown in the top panels. Magnification bar = 50 μm. The bottom panels are the same sections co-stained for P-ERK and DAPI. (B) The average fold change ± SEM of P-ERK staining intensity from control values, whose mean was made equal to one, is reported (n = 3 independent experiments) # P < 0.01 when compared to control levels, while † P < 0.01 when compared to CGRP stimulated levels at 2 hours.