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Effects on brood size of wild type C. elegans and bus-5 following 72 h exposure to a rosemary oil, b citrus oil and c eucalyptus oil at indicated concentrations. Error bars are based on the SE of six experiments measured on two different days. * p < 0.05, ** p < 0.01, *** p < 0.001 and **** p < 0.0001 for comparison of brood size upon EO treatment within indicated groups. ns not significant; np, no progeny
