Table 1. Rates of synonymous (K_s) and nonsynonymous (K_a) nucleotide substitutions (± standard errors) and their ratios (ω) for MEF2 protein-coding regions.

Gene	Codons	κ	ω	Ka	Ks
MEF2A	489	2.01	0.052	0.0184±0.0042	0.3533±0.0383
MEF2B	347	3.35	0.193	0.1578±0.0157	0.8193±0.1044
MEF2C	465	2.31	0.024	0.0059±0.0024	0.2435±0.0312
MEF2D	606	2.18	0.038	0.0146±0.0036	0.3832±0.0444

Note: All rates are based on comparisons between human and mouse MEF2 coding regions. κ indicates the ratio of the transition to transversion rates.