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RE: System-specific substructure naming schemes When I solved heme oxygenase, I ran into a hitch with secondary structure naming. An important helix was kinked. There were two copies of the monomer in the asymmetric unit, and the automated secondary structure assignment programs told me that one copy contained a single long helix while the other contained two shorter helices. I therefore decided not to fiddle with a naming scheme. Cheers, -- ======================================================================= With the single exception of Cornell, there is not a college in the United States where truth has ever been a welcome guest - R.G. Ingersoll ======================================================================= David J. Schuller modern man in a post-modern world MacCHESS, Cornell University [EMAIL PROTECTED]