Fig. 3. Pevkinin-2 excites the pyloric rhythm. (Left) During saline superfusion in a preparation where the STG was isolated from the CoGs, there was an ongoing pyloric rhythm. Note that, without the influence of spontaneously active CoG projection neurons, the pyloric rhythm was relatively slow and weak (see Fig. 1). (Right) During superfusion of pevkinin-2 (PevK-2), there was an increased pyloric rhythm speed as well as increased activity in the PD and LP neurons. Note also the increased number and amplitude of the LP-mediated IPSPs in the PD neuron during PevK-2 superfusion. The IC and VD neurons (mvn) were not activated by PevK-2 application.