Total RNA was extracted using TRIzol Reagent (Life Technologies) following the manufacturer's instructions. RNA was dissolved in RNase-free water fortified with RNase inhibitors (RNaseSUPERase-In; Life Technologies). The amount and purity (A260/A280 ratio) of the extracted RNA were assessed spectrophotometrically. cDNA was synthesized by reverse transcription from 2 μg RNA with a commercial kit and random primers (High-Capacity cDNA Reverse Transcription Kit; Life Technologies) following the manufacturer's instructions.
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