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<p>I have an EM map for a virus that includes an antibody bound to the envelope proteins. The envelope proteins <span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">are trimers of dimers with
C3 symmetry</span> that form spikes on the surface of the virus. I fit an atomic model for the spikes to the map using icosahedral symmetry, following the very helpful
<a href="http://www.cgl.ucsf.edu/chimera/videodoc/SymFitDNAb/" target="_blank">symmetric fitting video tutorial</a>. Now I am trying to fit a model for the antibody into the spike regions of the map. I need to impose C3 symmetry for the antibody for the fit
into each spike, in addition to imposing icosahedral symmetry to include all the spikes. How can I impose both of these in the fit? <br>
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<p>Thanks,<br>
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<p>Mike Kent<br>
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