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. 1999 May;6(3):307–316.

Figure 2.

Figure 2

CM promotes excitatory synapse formation and reduces the incidence of DM-induced inappropriate inhibitory synaptic connections between identified Lymnaea neurons. Identified neurons were soma–soma paired in DM for an initial period of 12 hr, at which point DM was replaced with CM. (A) A photomicrograph of soma–soma paired neurons LPeD1 and VD4 in CM. Note that the paired cells do not extend neurites. Twelve to 24 hr after CM substitution, simultaneous intracellular recordings revealed that the action potentials in RPeD1 produced 1:1 excitatory postsynaptic potentials (EPSPs) in VD2/3 (B), whereas a burst of action potentials in VD2/3 failed to alter the frequency of action potentials in RPeD1 (C). Likewise, an action potential in VD4 produced a 1:1 EPSP in LPeD1 (D). (E) Compound action potentials in LPeD1, however, failed to inhibit the firing of action potentials in VD4.