TABLE 4.

Half-lives of GAL1 mRNA^a

Strain	Long GAL1 RNA	Short GAL1 RNA
WTb	5.2	11
spt5-4	8.8	20
spt4	8.5	17
WTc	6.0	9.8
rpb2-10	9.9	12

^aThe half-lives of GAL1 RNAs were determined after yeast was grown on galactose-containing medium for 15 min, followed by the addition of glucose and harvesting of RNA for times up to 60 min. The two GAL1 RNA species were detected as described in the legend to Fig. 9. The SEMs were less than 15%. The value for rpb2-10 is the result for a single determination.

^bStrain FY1642, which is isogenic to FY1668 (spt5-4) and GHY180 (spt4), except for the indicated allele.

^cStrain Z96, which is isogenic to Z106 (rpb2-10), except as indicated.