模型中引入残基基团的概念，将蛋白质划分成若干个残基基团，通过这些残基基团的运动近似表征整个蛋白质的运动情况，并将配体小分子的运动处理为平移、转动和柔性键旋转三部分分量。

In the model, a concept of residue groups is introduced to describe the protein movement approximately and the movement of ligand is described by the translation, votation and torsion motions.

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