Total RNA was prepared from cultured cells using the TRIzol Reagent (Invitrogen) according to the manufacturer's instructions and dissolved in nuclease free water. After isolation, RNA used for microarray hybridisations was purified by the RNeasy Mini Kit (Qiagen) and the RNA quality was determined on a LabChip Bioanalyzer (Agilent Technologies).
Label
biotin
Label protocol
Approximately 8 µg of total RNA was processed to produce biotinylated cRNA targets.