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Fig. 1. Percent metamorphosis of Holopneustes purpurascens larvae (mean
± s.e.m.) of different ages after continuous exposure to 10 nmol
l–1, 100 nmol l–1 and 1 µmol
l–1 dissolved histamine and SSW for 1 h (A), 24 h (B) and 72
h (C). Data from 7-day-old, 14-day-old and 21-day-old larvae were pooled from
three batches (N=150 larvae per treatment); however, data shown for
28-day-old larvae are from batch A only (N=25 larvae per
treatment).