This command outputs basic data about the proteins in the
current alignment (e.g.as read in by alignment.append()).
This command is useful for preparation before comparative
modeling because it summarizes disulfides, cis-prolines, charges,
chain breaks, etc. Results which depend only on the amino acid sequences
are still written out even if some atom files do not exist.
# Example for: alignment.describe()
# Describe the sequences and structures in the alignment.
env = environ()
aln = alignment(env, file='toxin.ali', align_codes=('2ctx', '2abx'))
aln.describe()
