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Table 3 After partitioning sites into categories of solvent accessibility for 367 TAED families with solved three dimensional structures, Ka/Ks values were calculated across each family over branches and partitions. A stronger negative selective pressure with less variance is generally observed for the hydrophobic core of proteins.

From: A systematic search for positive selection in higher plants (Embryophytes)

Solvent Exposed Surface (Å2) Ka/Ks
s < 10 0.16 ± 0.05
10 ≤ s ≤ 30 0.25 ± 0.11
s > 30 0.28 ± 0.14