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. 2006 Mar 14;103(12):4428–4432. doi: 10.1073/pnas.0511333103

Table 1.

HOPPscore allowed regions

Category Frequency, f Symbol Score
Favored f > = x + 0.5σ F +2
Allowed x + 0.5σ > f > = x A +1
Unfavored x > f U +0.5
Disallowed f = 0 D −4

x, average frequency; σ, SD.