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(A) Representation of QUARK semi-reduced model where a protein chain conformation is specified by the full backbone atoms and the side-chain center of mass (SC). (B) Conformations of Ni, Cαi and Ci represented in the Cartesian system. (C) Conformations of Ni, Cαi and Ci represented in the torsion-angle system, where each atom position is determined by the distance, inner angle and torsion angle relationship to the previous three atoms.
