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Fig. 2. Effects of conditioned water (CW) on larval development of
Helisoma (A,C,D) and Lymnaea (B,E,F). (A,B) Incubation in CW
induced developmental retardation in both Helisoma and
Lymnaea. The effect disappeared after washout (CW-wash; the beginning
of washout is indicated by arrows). Water conditioned by juveniles raised with
plentiful food (CW-f) was ineffective. At the time when control animals
developed into postmetamorphic adult like forms (C,E), the animals in CW were
still at the veliger stage (D,F). Scale bars: 100 µm.
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