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Images show 5-HT immunoreactivity (yellow) within the brains of (a) uninfected (arrow shows position of TGN cell body) and (b) P. laevis-, (c) P. tereticollis- and (d) P. minutus-infected individuals. No differences, gross or fine, in brain anatomy from infected and uninfected individuals were observed. Bar shows 100 μm.
