Comparison of the effect of BIBN4096BS (20 mM, pH 5.8; +45 and +100 nA) and α-CGRP-(8 – 37) (1 mM in 160 mM NaCl, pH 4.5; +45 nA) in inhibiting the firing evoked by 10 s pulses of microiontophoretically applied L-glutamate (1.0 M, pH 8.0; −90 nA) onto a trigeminocervical complex unit linked to stimulation of the SSS, where sodium (150 mM; pH 7.0) has no apparent effect (+45 nA, grey bar). The firing rate indicated on the ordinate is indicated for 1 s bins by the rate histogram.