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Fig. 4. Immunofluorescence expression of 5-HT1Hel and
5-HT7Hel in the CNS of mature H. trivolvis.
5-HT1Hel-like immunoreactivity (A) and 5-HT7Hel-like
immunoreactivity (B–F) was observed in select neurites within neuropile
(arrows) and neurite tracts (arrowhead) in all ganglia of the CNS. The
expression observed in the cerebral ganglia (A and B), pleural ganglia (C and
D) and buccal ganglia (E and F) was representative of the pattern seen in all
ganglia. Immunoreactivity was not observed in neuronal somata. Scale bar, 30
µm.