Fig. 5. In Helisoma, 5-HT synthesis inhibitor PCPA (5 µM) accelerated
larval development (*P<0.05) (A) and reduced the
retarding effect of CW (B). The antagonist of monoamine receptors, ergometrine
(EM, 10 µM) attenuated the effect of CW (C) and 1 mM 5-HTP (D).