Table 1.

Summary of the selective pressure analyses.

	1 < ω < 98	0 < ω < 1	dN or dS = 0
Approximate analysis	168	2358	480
ML analysis	86	2483	523
Co-existed between two analyses	85 (dataset 1)	2357 (dataset 2)	480 (dataset 4)
GC content (%)	46.3 (39.4–55.0)	45.7 (38.6–60.6)	46.2 (35.4–62.3)

Numbers of orthologous pairs recovered from approximate analysis implemented in yn00 and maximum likelihood (ML) analysis implemented in codeml, numbers of pairs shared between the two analyses, and GC contents of the orthologs are shown.