VADAR (Volume Area Dihedral Angle Reporter) performs structural analysis of protein coordinate data . It provides the user with objective information on secondary structure, residue volume, accessible surface area as well as phi and psi angles, and hbonds. This data is further collated to provide a summary information and a quality index.
the Wishart Research Group, University of Alberta
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Leigh Willard, Anuj Ranjan,Haiyan Zhang,Hassan Monzavi, Robert F. Boyko, Brian D. Sykes, and David S. Wishart
“VADAR: a web server for quantitative evaluation of protein structure quality”
Nucleic Acids Res. 2003 July 1; 31 (13): 3316.3319