<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi Matthias,<div class="">The problem is not helix vs. sheet (it is definitely assigned as helix, for example try command “select helix”), but instead how the ribbon is calculated for that helix. I don’t know the precise problem nor have I been able to identify a workaround, so I’ll submit it as bug report. If I come up with anything, will let you know.</div><div class=""><br class=""></div><div class="">In the meanwhile, I note that our newer program ChimeraX uses different methods to calculate the ribbon and does not have a problem with this structure - image attached. You can get ChimeraX prerelease daily builds; it has some features Chimera does not, but it’s not a replacement (overall functionality-wise) for Chimera yet, so it all depends on what you want to do. You could certainly use both programs.</div><div class=""><<a href="http://www.rbvi.ucsf.edu/chimerax/index.html" class="">http://www.rbvi.ucsf.edu/chimerax/index.html</a>></div><div class=""><br class=""></div><div class="">Best,</div><div class="">Elaine<br class=""><div class="">----------<br class="">Elaine C. Meng, Ph.D. <br class="">UCSF Chimera(X) team<br class="">Department of Pharmaceutical Chemistry<br class="">University of California, San Francisco<br class=""><br class=""></div><div class=""><img apple-inline="yes" id="7E50403F-EAE4-44F4-9A62-DB4337C86022" src="cid:D81B2204-BA19-4D49-9E5A-6536E04B2E54@compbio.ucsf.edu" class=""></div><br class=""><blockquote type="cite" class="">On Jun 13, 2017, at 4:21 AM, Matthias Vorländer <<a href="mailto:matthias.vorlaender@embl.de" class="">matthias.vorlaender@embl.de</a>> wrote:<br class=""><br class="">Hi everyone,<br class="">for some reason, chimera displays one helix in a structure as a messed up beta sheet. I am attaching the PDB file and an image (same structure as backbone and ribbon representation). I have tried adding HELIX records manually, ksdssp or the setattr command, but the result is always the same. I would be very grateful for suggestions what could be causing this problem, as I will have to remake all my figures in pymol otherwise (which displays the helix correctly). <br class="">Many thanks<br class="">Matthias Vorländer<br class=""></blockquote><br class=""></div></body></html>