SUMMARY: CHOYCE is a web server for homology modelling of protein components and the fitting of those components into cryo electron microscopy (cryoEM) maps of their assemblies. It provides an interactive approach to improving the selection of models based on the quality of their fit into the EM map. AVAILABILITY: http://choyce.ismb.lon.ac.uk/ CONTACT: [email protected]; [email protected] SUPPLEMENTARY INFORMATION: Supplementary data are available at Bioinformatics online.

Abstract Summary: A user-friendly website for the analysis of protein secondary structures from Circular Dichroism (CD) and Synchrotron Radiation Circular Dichroism (SRCD) spectra has been created. Availability: It is accessible via a server located at http://www.cryst.bbk.ac.uk/cdweb Contact: Users may obtain information and apply for a UserID and password from [email protected]. Supplementary information: This website forms part of the electronic resources and information service of the Centre for Protein and Membrane Structure and Dynamics (CPMSD) located at http://www.srs.dl.ac.uk/VUV/CD/cpmsd.html. * To whom correspondence should be addressed (at Birbeck College).