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Fig. 2. Hemoglobin levels in juvenile daphnids (D. magna) following
treatment with the crustacean terpenoid hormone methyl farnesoate (A) and
three synthetic analogs (B-D). Hemoglobin levels were assessed
colorimetrically after 48 h exposure to the terpenoids. Ten daphnids were
exposed to each treatment. Values are means ±
S.E.M. *Significant difference
from the respective control (0 nmol l-1; P<0.05, ANOVA,
Dunnetts t-test).