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Pair potential 
derived from the subsets 𝒟ℬ1 (▿) and 𝒟ℬ6 (▵) versus the potential derived from the whole database. The regression lines are depicted. (a) Val-Val pair; the correlation coefficients are >0.99 (b) Asp-Arg pair; the correlation coefficients are comprised between 0.80 and 0.98.
