<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Luca,<div class="">Sorry no, there is just one ring fill color per residue. Although you can color different residues' ring fill in different colors from each other (and from their atoms), within a single residue you cannot color the base fill a different color from the ribose fill.</div><div class=""><br class=""></div><div class="">At first I thought maybe you could open the structure twice and only show ring fill for bases in one copy and for riboses in the other copy, but this is also not possible because there is also only one ring fill setting (on or off) per residue. </div><div class=""><br class=""></div><div class="">I can tell this from looking at the Selection Inspector for residues:</div><div class=""><img apple-inline="yes" id="A26DF376-EA7C-4C04-85B8-821D9282E42F" width="322" height="548" src="cid:BAF5F35D-717E-4213-B8A6-8B8FA2275282" class=""></div><div class=""><br class=""></div><div class="">Sorry about that,</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><blockquote type="cite" class="">On Mar 1, 2023, at 7:39 AM, Luca Pellegrini via ChimeraX-users <<a href="mailto:chimerax-users@cgl.ucsf.edu" class="">chimerax-users@cgl.ucsf.edu</a>> wrote:<br class=""><br class="">Is it possible to color differently the ring fill for sugar and base in DNA? When I select just the bases or just the riboses and then apply color using the ‘ring fill’ option, they both change to the new color.<br class=""><br class="">Thanks,<br class="">Luca<br class=""></blockquote><br class=""></div></body></html>