Hello, I have a question about the ssbond function in Rasmol. For protein with PDB code "1AOL", when typing SS-bond, it shows there are 6 SS bridges, and the distance between bonded sulfur atoms is around 2 Å. However, both PDB file and DSSP file do not indicate there are any SS-bonds for that protein. What scheme does Rasmol use to determine whether there is an SS-bond or not? Something other than DSSP and PDB file? Thanks very much. Yours sincerely, Nanjiang S ------------------------------ Nanjiang Shu, PhD Structural Chemistry Stockholm University Sweden