Hello Chimera community, I am rather new to Chimera, but in general familiar with PyMol. I switched to Chimera for the added functionality and general "free-ness," and so far I like it, but I'm having difficulty getting started. What I really need to do is identify the solvent exposed (SAS) residues that are charged. In particular I would like to identify exposed lysines, arginines, glutamic acids, and aspartic acids. All I need to do is identify and count them, is there a way to do this without slowly going over the entire molecular surface? Please bear in mind that I am capable of typing in commands, but I am no programmer. If it is too complex, I will simply, and sadly, have to do it manually. My fear with the manual approach is that I will miss something or miss-classify it. Your advise and help is greatly appreciated. PS. I've tried to do Render by Attribute -> areaSAS, but that doesn't seem to be working for me even after I tell it to calculate the surface. I'm not sure what I'm doing wrong if this is the approach that I am supposed to be taking. Best regards, George