| First, many heterochromatic genes have large introns relative to the genome as a whole. |
| This finding is the first suggestion that multiple spliceosomal introns occur in ribosomal genes. |
| The coding region is interrupted by several synthetic introns to improve gene expression. |
| Vertical full lines delimit introns, and vertical dotted lines delimit the intergenic spaces. |
| Another characteristic feature that distinguishes eukaryotic from prokaryotic genes is the presence of introns. |
| The differences between plants and animals may be especially pronounced with regard to introns. |
