Table 3.

MEPE properties under positive selection determined in TreeSAAP.

Property	Category	Z-Score
Compressibility	7	3.783***
Equilibrium constant (ionization of COOH)	8	3.236***
Isoelectric point	8	3.418***
Power to be at the C-terminal	7	1.926*
Power to be at the middle of alpha-helix	7	3.757***
Power to be at the N-terminal	8	2.373**
Solvent accessible reduction ratio	7	3.953***
Turn tendencies	7	2.307*

List of properties under selection, the impact category and the level of significance (*** p < 0.001; ** p < 0.01; * p < 0.05).