G Protein bg Subunit-Mediated Presynaptic Inhibition: Regulation of Exocytotic Fusion Downstream of Ca2+ Entry Trillium Blackmer, Eric C. Larsen, Michiko Takahashi, Thomas F. J. Martin, Simon Alford, and Heidi E. Hamm

Supplementary Material

Supplemental Figure 1. The effect of serotonin on action potential-evoked calcium transients in the lamprey giant axon. Axons were labeled with the low-affinity calcium indicator Fluo-4 dextran and stimulated with a single action potential. Calcium hot spots were recorded that showed a single exponential phase of decay to baseline and that were unaffected by the application of serotonin (30 mM; shown in red, control in black).

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