Table 1.

Temperature-Sensitive Binding of Mutant RB Alleles

	Mean ± SD β-Galactosidase Activity ata(% of WT)
cDNA	30°C	24°C
WT RB	100 ± 21.5	100 ± 24.8
706F	.3 ± .1	.4 ± .4
707W	53.4 ± 6.3	46.1 ± 4.8
661W	9.4 ± 1.6	57.4 ± 9.6
Δ480	23.6 ± 2.9	63.9 ± 4.1
712R	1.9 ± .5	20.6 ± 5.4

^aOne unit β-galactosidase hydrolyzes 1 μmol ONPG to O-nitrophenol and D-galactose/minute/cell.