From: The expansion of amino-acid repeats is not associated to adaptive evolution in mammalian genes
Acidic
Basic
Polar
Hydrophobic
PSGs
10 (0.95)
0 (-1.08)
7 (-2.51)
17 (3.23)
non-PSGs
970 (-0.083)
154 (0.094)
2314 (0.22)
1031 (-0.28)