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Northern blot analysis of differentially expressed patterns of CYP4G2, CYP4D4v2, and CYP6A38 between permethrin treated and untreated susceptible CS and resistant ALHF house flies. mRNAs were isolated from the whole bodies of 20 surviving house flies 24 h after permethrin treatment with 2 μg/fly. Blots were hybridized with the cDNA probes derived from three P450 gene fragments. The ethidium bromide stain of 18S ribosomal RNA in agarose gel is shown at the bottom.
