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. 2012 Feb 20;7(2):e31737. doi: 10.1371/journal.pone.0031737

Figure 4. C2 characteristics in Melibe leonina.

Figure 4

A. Backfilling the pedal commissure with biocytin labeled 3–4 neurons near C2Mel (left). Only the cerebral-pleural ganglion contralateral to the backfilled nerve is shown. FMRFamide-like immunohistochemistry labeled C2Mel (middle). Combining FMRFamide-like immunoreactivity with the backfill revealed just one neuron, C2Mel (right). B. C2Mel could be identified visually due to its characteristic white soma near the origin of cerebral nerve 1 (CeN1, white arrows). An asterisk (*) labels the statocyst. Only one cerebral-pleural ganglion is shown. C. Filling the C2Mel soma with Neurobiotin revealed a branching contralateral axon projection through the anterior cerebral-pedal commissure (not shown) and into the pedal commissure (PP2). The example is a representative image in which the outline of the brain and the axon projection were traced for ease of viewing. D. C2Mel (arrow) was filled with biocytin (left). It was immunoreactive for both FMRFamide (middle) and SCPB (right) as shown.