Hi all, what is the difference between the monomers db which is provided by coot and the one which is provided by refmac/ccp4? Can one interchange them? thanks justin -- Justin Lecher Institute for Neuroscience and Biophysics INB 2 - Molecular Biophysics II Research centre Juelich GmbH, 52425 Juelich,Germany phone: +49 2461 61 5385