Hi group, So I am struggling with hydrogens in proteins. I have neutron data which shows H-atom positions. Well, Deuterons, but here are the issues. If I open a pdb in Chimera with old school hydrogen names like HG1, how can I get it to write out the new ones (like HG11) without explicitly adding the hydrogens in Chimera? I don't want the atom positions to change. Also, I notice Chimera doesn't seem to handle deuterons optimally. Writing out the pdb moved the atom name column to the left one space and changed the atom type in the last column back to H. The problem is caused by Coot, which we use to perform real space refinement of atom positions, but to quote George Sheldrick, "I think that we will have to 'remediate' Coot (and the whole of CCP4 for good measure). I advise all SHELXL users NEVER to deposit hydrogen atoms, it saves lots of hassle." Unfortunately, the point of my project is to see the hydrogens!!!! Thanks for any help you can offer, Wally Walter R.P. Novak, Ph.D. Postdoctoral Fellow Rosenstiel Basic Medical Research Center Brandeis University 415 South St. MS 029 Waltham, MA 02454-9110 Phone: (781) 736-4944 Fax: (781) 736-2405