FIG. 6.

Deleting TPI introns 1 through 5 eliminates the reduction in mRNA abundance brought about by 23Ter but not by 189Ter. NIH 3T3 cell transfections and the purification and analysis of total-cell RNA were as described in the legend to Fig. 1. Values shown are an average of the values obtained from two independently performed experiments, which did not differ by more than 5%.