This step occurs by transesterification; in this case, an OH group at the ... mechanisms of RNA splicing, splicing itself must be quite ancient. Proponents of the "intron-early" theory suggest ...

What's the difference between mRNA and pre-mRNA? It's all about splicing of introns. See how one RNA sequence can exist in nearly 40,000 different forms.

RNA splicing is a cellular process that is critical ... as U1 snRNA binds to the 5' splice site at the beginning of the intron. Until now, it had been thought that the binding strength between ...