FIG. 4.

Summary of effects of NRS point mutations on RNA splicing. To give an overall view of the distribution of RNA, calculations were based on data using both riboprobes. The amount of splicing at the myc donor site was first determined directly from the data in Fig. 1. We then calculated the distribution of the remaining RNA between cryptically spliced RNA (splicing within the NRS) and unspliced RNA based on data with the NRS probe (Fig. 2).