Total RNA was extracted from the whole bodies of P. xylostella second instar larvae using Trizol reagent (Invitrogen/Life Technologies, Paisley, UK) as per manufacturer's instructions and then quantitated by calculating the absorbance ratio and by agarose gel electrophoresis. First strand cDNA was synthesized from 2 μg of RNA with the RevertAid First Strand cDNA Synthesis Kit K1622 (Thermo Scientific, US) by following the manufacturer's protocol.
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