| | Human | Mouse | Rat |
| <100 | 28.82% | 37.95% | 36.92% |
| <500 | 27.00% | 27.14% | 23.13% |
| <2000 | 12.11% | 9.10% | 11.72% |
| <5000 | 5.06% | 6.09% | 7.29% |
| <10000 | 4.63% | 4.56% | 6.13% |
| <20000 | 5.37% | 4.40% | 4.55% |
| <50000 | 7.14% | 4.97% | 5.59% |
| <100000 | 4.67% | 2.79% | 2.31% |
| <500000 | 4.56% | 2.38% | 2.13% |
| >500000 | 0.63% | 0.63% | 0.24% |
| >20 | 62.17% | 62.79% | 41.59% |
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The last row of the table shows the fraction of RefSeq sequences that had a genomic extension larger than 20bp, out of all assigned RefSeq records (see top table). The distribution of those extensions (from 20bp and above, as a fraction of all extensions over 20bp) are shown in the figure.
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