library_construction_protocol: For each sample, 1μg of the total RNA was used for RNA-seq library preparation by VAHTS Stranded mRNA-seq Library Prep Kit (Vazyme). Polyadenylated mRNAs were purified and fragmented, and then converted into double strand cDNA. After the step of end repair and A tailing, the DNAs were ligated to VAHTS RNA Adapters (Vazyme). Purified ligation products corresponding to 200-500 bps were digested with heat-labile UDG, and the single strand cDNA was amplified, purified, quantified and stored at -80℃ before sequencing. RNA libraries were prepared for sequencing using standard Illumina protocols