Figure 2.

Design of microarray experiments. Microarray analysis was used to measure transcriptomic profiles in drug-susceptible (S) or EMB resistant (PT) salmon louse strains. In experiment 1, adult male salmon lice were collected for RNA extraction directly after removal from host fish. In experiment 2, salmon lice were removed from hosts and then subjected to exposure of seawater containing 200 μg L^-1 of EMB for 1 or 3 hours before sampling. Control treatments included exposures to seawater, or seawater containing the solvent PEG₃₀₀, which was used to solubilise EMB. The number of pools of four salmon lice sampled for each combination of treatment and strain is given as n.