TABLE 2.

Fitting parameters in Figs. 8 and 13

	Fitting parametersa
	Intercept	Slope
WT	−2.57 ± 0.09	2.52 ± 0.18
R556E	−2.68 ± 0.14	1.78 ± 0.30
E644R	−2.32 ± 0.09	1.71 ± 0.19
R556E/E644R	−2.77 ± 0.09	2.42 ± 0.20
D557R	−2.21 ± 0.08	1.48 ± 0.10
R638D	−2.73 ± 0.15	1.78 ± 0.30
D557R/R638D	−2.23 ± 0.08	1.46 ± 0.15
K605E	−1.87 ± 0.10	1.43 ± 0.20
E394R	−1.66 ± 0.10	0.49 ± 0.21
D399R	−1.68 ± 0.09	0.64 ± 0.19

^a The values presented are the mean ± S.E. in a least-squares fitting.