Here is a sample session with pepcoil. It reads in a protein sequence. Here is the output file from the example run. The SwissProt annotation marks the true leucine zipper motif as from 253 to 274. The leucine zipper is a special case of a coiled-coil region.
Data files None.
Diagnostic Error Messages None. It always exits with a status of 0. Known bugs None. This program is intended to be used by everyone and everything, from naive users to embedded scripts.