The output file can be used as a codon usage table in other applications.
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The example usage read in a single CDS from Pseudomonas aeruginosa which has a very high GC content ands a strong coding bias, as shown by the codons for Alanine where those ending with G or C are used almost exclusively.
The 'Fract' column gives that proportion of usage of a given codon among its redundant set (i.e. the set of codons which code for this codon's amino acid). For example, the sum of the 6 codons representing serine will add up to 1.00.
The /1000 column represents the number of codons, given the input sequence(s), there are per 1000 bases. This will be an extrapolation if the sequence is shorter than 1000 bases.
If multiple sequences are input then the statistics are given for all of the sequences together, not individually.