library_construction_protocol: RNA was purified by using absolutely RNA kit from Agilent. Total RNA samples (300ng) were used as provided by the user. RNA Quality scores were 9.9 on average (range 9.0-10) when assayed on a PerkinElmer LabChip analyzer. Sequencing libraries were prepared with the "QuantSeq 3' mRNA-Seq Library Prep Kit (FWD) for Illumina" (Lexogen, Cat.No. 015) by following manufacturer instructions. Library generation is initiated by reverse transcription with oligodT priming, and a second strand synthesis is performed from random primers by a DNA polymerase. Primers from both steps contain Illumina-compatible sequences. Libraries are completed by PCR {This kit generates directional libraries stranded in the sense orientation (the read1 (the only read in single read format) has the sense orientation (--library-type fr-secondstrand in TopHat, --stranded=yes in HTSeq).}  cDNA libraries are purified, applied to an Illumina flow cell for cluster generation and sequenced on an Illumina instrument (see below) by following manufacturer's protocols.