exon->contig_id gives contig internal_id
exon->contig_id gives contig internal_id

at7/ensembl,muffato/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,willmclaren/ensembl,at7/ensembl,mjg17/ensembl,james-monkeyshines/ensembl,danstaines/ensembl,danstaines/ensembl,mjg17/ensembl,at7/ensembl,james-monkeyshines/ensembl,muffato/ensembl,Ensembl/ensembl,mjg17/ensembl,danstaines/ensembl,willmclaren/ensembl,Ensembl/ensembl,Ensembl/ensembl,mjg17/ensembl,at7/ensembl,james-monkeyshines/ensembl,muffato/ensembl,muffato/ensembl