Hello Todd,
GCG indeed does not provide a lot of codon usage tables.
On our srs server we have a database of codon usage tables
(CUTG) in a format suitable for gcg. Go to
http://www.seqnet.dl.ac.uk/srs/srsc?[CUTG-id:1973]
and you will get a bovine codon usage table.
Cheers,
Martin
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