transcription elongation Humans 24 alternative RNA splicing 22 human 22 Alternative Splicing 18 RNA polymerase II 18 priority journal 18 messenger RNA 16 nonhuman 16 Alternative splicing 12 chromatin structure 12 exon 12 gene expression 12 genetics 12 Chromatin 10 RNA Polymerase II 10 RNA processing 10 Transcription, Genetic 10 genetic transcription 10 intron 10 transcription regulation 10 Animals 8 RNA Precursors 8 RNA splicing 8 RNA translation 8 Review 8 article 8 controlled study 8 nucleosome 8 protein bcl x 8