Expression of calcitonin gene-related peptide (CGRP) and SNAP-25 in trigeminal ganglion neurons. The expression of CGRP (A) and SNAP-25 (B) are shown in the entire trigeminal ganglion obtained from an untreated adult animal. At higher magnification, neuronal processes(arrows) expressing both CGRP (C) and SNAP-25 (D)that extend from neuronal cell bodies in one cluster to another cluster are observed. Neuronal processes expressing SNAP-25 are also observed within neuronal clusters (E). Headache: The Journal of Head and Face Pain, Volume 47, Issue 7, Page 1008-1023, Jul 2007, doi: 10.1111/j.1526-4610.2007.00854.x