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James Holton wrote: > I think the definition of a "coiled coil" is that the helices are > symmetric (Crick 1953). This is only true for parallel in register coiled coils. There are many coiled coils that are antiparallel, see e.g. the SOCKET database at http://www.lifesci.sussex.ac.uk/research/woolfson Best wishes, Sergei