Here is a sample session with chips. If all codons are used, the Nc value will be 61. If only one codon is used for each amino acid the Nc value will be 20. Low values therefor indicate a strong codon bias, and high values indicate a low bias and possibly a non-coding region. Data files chips reads a codon usage file but only as a template and ignores the original data.
Users can provide their own data files in their own directories.
This program is intended to be used by everyone and everything, from naive users to embedded scripts.