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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;
-m-T,
-methyl-tryptophan;
-m-DOPA,
-methyl-DOPA; NSD, 3-hydroxybenzilhydrazine; PCPA,
L-p-chlorophenylalanine; EM, ergometrine maleate.