Figure 1. Effect of administration of capsaicin to the dental pulp at a pH of 7.4 and 6.5. Capsaicin evoked a significant increase in CGRP over basal rates of release: 9.5 fmmol/2.1 mL at a pH of 6.5 and 6.5 fmol/2.1 mL at a pH of 7.4. Recovery 1, 2, and 3 indicate successive fractions after capsaicin stimulation. While fractions continued to be collected, data (not shown) dictated that levels returned to baseline.