isoform2refseq_ensembl.tb tab-delimited file with 5 cols: 1) Isoform ID 2) UniParc ID 3) Taxon ID 4) RefSeq or EnsEMBL 5) RefSeq or EnsEMBL ID ac2isoform.tb tab-delimited file with 3 cols: 1) UniProtKB AC 2) Isoform ID 3) 1/0 to indicate if the isofom is the canonical sequence