Genomic structures of novel TUs. A. TU4. B. TU7. C. TU11. D. TU52. E. TU54. Initial paired-end ditag: dark blue. Exons of validated full-length cDNA sequences: orange. Exons of previously known transcripts at each locus: teal (protein-coding sequence: shaded). 3' terminal exon arrows: direction of transcription. Quantitative real-time PCR primer locations: red arrows. All validated cDNA sequences can be found in Additional file 2.