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Fig. 9. (A) Changes of average anti-5-HT immunofluorescence in the anterior neurones of Helisoma, after 6 hours of incubation with 5-HTP and {alpha}-m-T; normalized to controls. (B) Changes of average glyoxylic acid-induced fluorescence of catecholamines in the anterior neurones of Lymnaea after 6 hours of incubation with CW, L-DOPA and {alpha}-m-DOPA normalized to controls. *Significantly different from control, P<0.05. (C) Representative micrographs of glyoxylic acid-induced fluorescence in the anterior neurones of Lymnaea, showing increase after incubation with L-DOPA, and reduction after incubation with {alpha}-m-DOPA. Scale bar: 20 µm.