Well, in fact, B-DNA built with coot is slighlty C2*-endo and markedly C3*-exo. In comparison a B-DNA built with X3DNA is markedly C2*-endo. See the attached figures. I agree with Maia that this is what I would have expected. Perhaps Paul can tell us where does coot take the "ideal" values from? Cheers, Miguel 2008/10/25 chern

Hi all, does anybody know why coot and sybil (and may be others that I don't know about) generate an ideal dna with C3*-exo puckers instead of C2*-endo, as text books say.

maia

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