gene exon 1 exon 2 exon 3 Chromosomal DNA intron 1 intron 2 Transcription (RNA synthesis) exon 1 exon 2 exon 3 Nuolcar RNA 5'GU..AG-0H-31 RNA Splicing exon 1 e×0n2 e×on3 Messenger RNA RNA synthesis and Iprocessing 05´GU……AG-OH-3´