Hi CCP4ers, Apologies for this off-topic question, but I believe someone in this community could help me. Suppose if I know the position of every 3rd or 4th or n-th unit (amino acid or nucleotide or any moiety) of any helix (not just the protein & nucleic acid helices), is it possible to generate the complete the helix. If one could, could someone point out a software that could do it. Thanks in advance. Cheers John