Dear ChimeraX users, I just subscribed so apologies if this has been asked before. When is type the command: color zone #2 near #1/A distance 5 sharpEdges false farColor blue I have the volume #2 in blue with chain A colored by atom type: i.e. with carbons in sand, oxygens in red, nitrogens in blue. I tried to follow the tutorial on youtube, downloading the model and emdb like in the tutorial, and it does work like the tutorial, meaning colored by chain. I am wodering what is going on and how to fix it? I've seen this behavior for my protein, on a PDB refined from Phenix, or from a download from the rcsb. I don't see anything special on the PDB, all the atoms are listed normally. Is it possible to assign a specific color per chain using this command? Thank you for your help. best Vincent -- Vincent Chaptal, PhD Director of GdR APPICOM Drug Resistance and Membrane Proteins Lab MMSB -UMR5086 7 passage du Vercors 69007 LYON FRANCE +33 4 37 65 29 01 http://www.appicom.cnrs.fr http://mmsb.cnrs.fr/en/