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The definitions of the 21 atom types of proteins used in the SASA-based solvation model
(1) α represents C that is connected with only one O atom; (2) β represents C with sp3 hybridization; (3) X is O or S atom; (4) Y is N or C atom; (5) R is H or C atom; (6) Atoms at E1, E2 and E3 are N, O or S
