(1) Coiled coils commonly contain a heptad of residues labeled A-G, repeated at least three or four times.(2) Add vowels to create words, then delete this heptad of words.(3) The amino acids in the heptad repeats that constitute the predicted coiled-coil regions are underlined.(4) The zipper was positioned either immediately after the heads or following 15 heptads of native sequence.(5) In fibrous proteins, the coiled coil structures can be many heptads long.
