Mike? Cherry at harvard is/was providing tables of codon frequencies for many species... they were/are available at frodo.mgh.harvard.edu:[.codon] and ftp.bio.indiana.edu:archive/molbio/data -- Allen Delaney (allen at brc.ubc.ca) Biomedical Research Centre, U.B.C., Vancouver, B.C. Canada, V6T 1Z3