I are there any tutorial or comment constrains file available. I have been unable to find any in the documentations. What I am particular is looking into is make a constrain between the cofactor and the ligand.I would be happy to see any constrain files that are available for the public. There was a set of good tutorial at Meierlab but it seems that they have removed them. A good example would be to have a distant between the Oxygen and the iron of hemoglobin.