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The occurrence of slabs (M) and retained introns (IR) as observed for user-defined genomic coordinates representing the 200 randomly selected long non-coding intronic regions (Additional file 1: Table S2)
| IR present | IR absent | |
|---|---|---|
| M present | 57 | 10 |
| M absent | 52 | 81 |
| Median intron length (bp) | 192 | 2181 |
| Average intron size (bp) ± standard error | 354 ± 67 | 5323 ± 841 |
| Frequency of 1st intron | 73 (67%) | 24 (26%) |
