Hi Chimera crew, I am using chimera to visualize an MD trajectory. I want to look at the fluctuations of hydrogen bonding patterns in a helix over the course of the trajectory. Is there a way to use Find HBonds on each frame and display the updated pseudobonds as I view the movie in Chimera? Also, may I take this occasion to point out that requiring consecutive frames to have consecutive numbers in the file names is inconvenient. For instance, my simulation is 41 ns long, and the structures are stored (in our in-house format) every 1 ps. So rather then write out 41000 .pdb files, I'll write them out every 10 or 100 ps. To use chimera to view a movie, I have to rename the files using a perl script. Incidentally, I've been using Chimera for 3 years now and love it. -Eric Merkley Graduate student Biochemistry Department University of Washington