Table 1.

Results of single-turnover experiments

The low and high values are limits of nonsymmetrical confidence intervals (profile-t method of Bates and Watts (42)) at 68% confidence level.

Isoform	1000 × khyd	Low	High	t½
	min−1			min
H-Ras	16 ± 3	13	19	40
K-Ras	6 ± 1	4	7	120
N-Ras	6 ± 2	4	8	120
H-Ras + Raf	14 ± 2	12	15	50
K-Ras + Raf	11 ± 1	10	13	60
N-Ras + Raf	6 ± 1	5	7	120
H-RasQ95L	19 ± 3	17	22	40
H-RasH166Y	19 ± 1	18	20	40
H-RasY141F	15 ± 1	14	16	50