Figure 5.
Cap-defective mutant L proteins produce uncapped abortive short transcripts. Transcripts, synthesized by the WT or cap-defective mutant L proteins, were post-labeled by vaccinia virus capping enzyme in the presence of [α-32P]GTP and analyzed by 20% urea-PAGE followed by autoradiography. Lanes 1 and 4 indicate no L protein. Lane 11 indicates a longer exposure of lane 7. The positions of previously identified capped RNAs (18) are shown.