  Interactive molecular graphics applications facilitate analysis of three
dimensional protein structures. Naturally, non-interactive 2-D snapshots of the
protein structures do not convey the same level of geometric detail. Several
2-D visualization methods have been in use to summarize structural information,
including contact maps and 2-D cartoon views. We present a new approach for 2-D
visualization of protein structures where amino acid residues are displayed on
a circle and spatially close residues are depicted by links. Furthermore,
residue-specific properties, such as conservation, accessibility, temperature
factor, can be displayed as plots on the same circular view.
