Table 1. INVPEPs in 3967 representative protein chains from the Protein Data Bank (PDB).
| INVPEP sequence Length (number of amino acid residues) | Number of non-redundant INVPEPs observed in representative PDB dataset | Number of INVPEPs of known secondary structure conformation | Number of INVPEPs for which solvent accessibility calculated | Number of INVPEPs with difference in solvent accessibility values ≤1 Å2 | Number of unique INVPEPS in non-redundant PDB dataset | Number of unique PDB_IDs representing the INVPEPS |
| Five | 148313 | 125397 | 124921 | 3520 | 93493 | 3760 |
| Six | 9005 | 5331 | 5297 | 168 | 8478 | 3495 |
| Seven | 10460 | 460 | 454 | 15 | 577 | 1378 |
| Eight | 995 | 40 | 40 | 1 | 91 | 493 |
| Nine | 1279 | 2 | 2 | 1 | 24 | 245 |
| Ten | 607 | 1 | 1 | 0 | 9 | 171 |
| Eleven | 107 | 0 | 0 | 0 | 3 | 109 |
| Twelve | 1 | 1 | 1 | 0 | 1 | 1 |
| Eighteen | 1 | 0 | 0 | 0 | 1 | 2 |