<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Valeria,<div class="">If you mean straight lines between CA atoms, sorry no, there is no CA trace display in ChimeraX yet. It is #694 in our ticket database.</div><div class=""><br class=""></div><div class="">You can show a spaghetti-type ribbon that goes through the exact CA positions but is curved in between, e.g.</div><div class=""><br class=""></div><div class="">cartoon</div><div class="">cartoon style arrows f xsect oval width 1 thick 1</div><div class=""><br class=""></div><div class="">as shown for the purple protein in rightmost image here:</div><div class=""><<a href="http://www.cgl.ucsf.edu/home/meng/chimerax/docs/user/commands/cartoon.html#subcommands" class="">http://www.cgl.ucsf.edu/home/meng/chimerax/docs/user/commands/cartoon.html#subcommands</a>></div><div class=""><br class=""></div><div class="">In that case you could use different width and thickness values. If you want to additionally show CA balls, maybe something like:</div><div class=""><br class=""></div><div class="">cartoon suppressBackbone false</div><div class="">cartoon style arrows f xsect oval width .5 thick .5</div><div class="">show @ca</div><div class="">style @ca ball</div><div class=""><br class=""></div><div class="">… as shown in attached image. I hope this helps,</div><div class="">Elaine</div><div 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=""></div><div class=""><br class=""></div><img apple-inline="yes" id="6A7B163E-0C9A-4681-9625-65C2F5B96C3B" src="cid:EB38EF5F-6276-4E77-ADF8-51EEBBB5BE43" class=""></div><div class=""><br class=""><blockquote type="cite" class="">On Sep 18, 2018, at 9:09 PM, <a href="mailto:v.kalienkova@bioc.uzh.ch" class="">v.kalienkova@bioc.uzh.ch</a> wrote:<br class=""><br class="">Dear all,<br class="">I was wondering, is there an option to just show a Ca trace in ChimeraX?<br class="">If yes, can one modify the width of it?<br class="">Thanks a lot in advance,<br class="">Valeria<br class=""></blockquote><br class=""></div></body></html>