Fig. 10. Representative fluorescence micrographs of PCPA induced reduction of anti-5-HT immunofluorescence (green) in the anterior neurones of Helisoma; cilia are labelled in red (LSM projections; 20x0.5 µm). (A) Control. (B) After 3 days of incubation with 5 µM PCPA. Scale bar: 10 µm.