Hi Robert, Thanks for your reply. We have done this with standard samples and we see the same thing. And of course, we can tell qualitatively from the XANES that our sample is not 8 coordinate, and not even 6 coordinate. We have never tried changing the temperature but we can try this the next time we go to SSRL. We actually do fit multiple scattering features as imidazoles which is one of the things we consider as a strength of Artemis for our basic needs. This is part of why we think this is strange, because putting 8 imidazoles around a zinc seems kind of silly but it likes it. 5 imidazoles and 3 sulfurs and I have an R-factor of 0.2% every time. If there is non standard multiple scattering that occurs in multiple unrelated proteins from different organisms then we would have no idea what this could be. Thanks for your comments! Carolyn Carr