2Struc: the secondary structure server. The defined secondary structure of proteins method is often considered the gold standard for assignment of secondary structure from three-dimensional coordinates. However, there are alternative methods. ‘2Struc: The Secondary Structure Server’ has been created as a single point of access for eight different secondary structure assignment methods. It has been designed to enable comparisons between methods for analyzing the secondary structure content for a single protein. It also includes a second functionality, ‘Compare-the-Protein’ to enable comparisons of the secondary structure features from any one method to be made within a collection of nuclear magnetic resonance models, or between the crystal structures of two different proteins. Availability: http://2struc.cryst.bbk.ac.uk

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