The other menu contains a series of half-way useful options that are hard
to place in other menus.
The option CHIHST will cause WHAT IF to prompt you for a range
of database proteins. Per residue type four phi-psi plots will be made:
upper left for helical residues, upper right strand residues, lower
left turn residues, lower right random coil residues (the rest).
The plots for the twenty residue types will be displayed as a movie.
The 20 movie steps are for ACDEFGHIKLMNPQRSTVWY respectively.
The results are also written out in twenty files called ALA.CHS,
CYS.CHS, etc. In these files you find molecule, secondary structure
state, residue type and the torsion angles Phi, Psi, Omega and
Chi 1 till 5 where applicable.
The command CHSHOW will prompt you for an amino acid, and for two
torsion angles (choose from F, P, O, 1, 2, 3, 4, 5 for phi, psi,
omega and chi 1 till 5 respectively). It will read the output
file generated by the CHIHST option, and make a MOL-item out
of one of the steps of the movie. (sorry, but this is the only
way of plotting CHIHST movie steps).