Hello, My guess is there is something strange about the structure or the format of the input file -- for example, maybe the residues don't all have the same chain ID, or the backbone atoms do not have the expected names (N,CA,C,O). If Chimera does not show a ribbon at that position even though you told it to show ribbons for everything, it is probably necessary to edit the input file to fix the problem. I couldn't be more specific without seeing the file. Best, Elaine ----- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Nov 27, 2009, at 2:16 AM, klumpler@sci.muni.cz wrote:

Hallo, please, can you tell me how to create missing part of ribbon representation of loop?

Using "ball and stick" representation is peptide chain complete without gap, but in "ribbon" representation is one residue missing and forms the gap.

Thank you very much