Ensembl extensions. Exon extensions to Ensembl predictions can be obtained from exons predicted by TWINSCAN and/or SGP2. These exons can either (a) be part of a transcript with exons in common with the Ensembl transcript (linked) or (b) be part of a close but non-overlapping transcript (unlinked).
Eyras et al. BMC Bioinformatics 2005 6:131 doi:10.1186/1471-2105-6-131