Distribution of proteins in <i>structure</i> space.

<p>Each point represents one protein. <b>a)</b> Protein structures as described by eigenvectors 1 and 2. In plot <b>a)</b> the same proteins as in Fig. 3 are labelled. <b>b)</b> same projection as in <b>a)</b>, but colored according to SCOP structure classes (see legend). Distributions of SCOP classes are described by their standard deviations (thin large ellipses) as well as the standard deviation of their respective means (thick small ellipses).