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Fig. 7. Effect of the tested drugs on the duration of larval development in Helisoma (A) and Lymnaea (B) measured from stage 19 till stage 27, and normalized by controls (*significantly different from control; P<0.05). CW, conditioned water; CW-f, water conditioned by fed juveniles; 5-HTP, 5-hydroxy-L-tryptophan; LDOPA, L-3,4-dihydroxyphenylalanine; 5-HT, 5-hydroxytryptamine creatine sulphate; DA, dopamine; {alpha}-m-T, {alpha}-methyl-tryptophan; {alpha}-m-DOPA, {alpha}-methyl-DOPA; NSD, 3-hydroxybenzilhydrazine; PCPA, L-p-chlorophenylalanine; EM, ergometrine maleate.