The possibility of representing the conformations of a pair of peptide units in terms of two parameters, namely angle (nu) between the two peptide planes and the virtual-bond angle delta (C(alpha)i-1, C(alpha)i, C(alpha)i+1), and its usefulness in recognizing unfavourable conformations, is discussed. To exemplify the concept, the local conformations in lysozyme have been plotted in the (nu,delta) plane.

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