Abstract
We have analyzed the pathways and kinetics of processing of mouse tRNA gene transcripts in vitro. Different transcripts are processed along two alternative pathways. The 3′ trailer sequence of the tRNAHis primary transcript is excised before the 5′ leader sequence. In contrast, for the tRNAGly primary transcript, the 5′ leader sequence is excised before the 3′ trailer sequence, as has been found for other monomeric eukaryotic tRNA gene transcripts.