转录组分析流程
总结来说：
A PSI value was given according to the ratio of the long form on total form present (short form and long form) to characterize inclusion of exon, differential splice-site choice, intron retention, etc.
对于ASE来说，PSI = splice_in / (splice_in +splice_out), 在RNA-seq 数据中splice_in 和splice_out分别是支持splice in 和splice out 发生的reads的数目，具体的请参看剪接事件识别软件的描述。引用链接
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