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Table 2 Classification of sidechain angles, χ i

From: An effective all-atom potential for proteins

Residue χ 1 χ 2 χ 3 χ 4
Ser, Cys, Thr, Val I    
Ile, Leu I I   
Asp, Asn I IV   
His, Phe, Tyr, Trp I III   
Met I I II  
Glu, Gln I I IV  
Lys I I I I
Arg I I I III
  1. The parameters of the torsion angle potential are (, n i ) = (0.6 eu, 3) for class I, (, n i ) = (0.3 eu, 3) for class II, (, n i ) = (0.4 eu, 2) for class III, and (, n i ) = (-0.4 eu, 2) for class IV.