Total RNA was isolated from cells using Trizol reagent (Life Technologies, Paisley, UK) and purified using MaXtract High Density (QIAGEN, Redwood City, CA). RNA yield and quantity were determined using a Nanodrop spectrophotometer ND-1000 (Thermo Scientific, Wilmington, DE). The RNA quality was tested using an ND-1000 V3.7.1, according to the manufacturer’s instructions, and assigned an RNA integrity number (RIN). Only samples with an RNA integrity number (RIN) of 8 or greater were employed as was previously described51 (link).
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