| PDB | Chain | Name | Length | Cyclization | Rings | Disulfide | Type | Source | Method |
|---|---|---|---|---|---|---|---|---|---|
| 1HIS | A | INSULIN | 21 | SS | 1 | 1 | Natural | Homo Sapiens | SOLUTION NMR |
| 1HIT | A | INSULIN | 21 | SS | 1 | 1 | Natural | Homo Sapiens | SOLUTION NMR |
| 1HJE | A | ALPHA-CONOTOXIN SI | 14 | SS | 2 | 2 | Natural | Conus Striatus | X-RAY DIFFRACTION |
| 1HLS | A | INSULIN | 21 | SS | 1 | 1 | Natural | Homo Sapiens | SOLUTION NMR |
| 1HLY | A | HONGOTOXIN 1 | 39 | SS | 3 | 3 | Natural | Centruroides Limbatus | SOLUTION NMR |
| 1HP2 | A | TITYUSTOXIN K ALPHA | 37 | SS | 3 | 3 | Natural | Tityus Serrulatus | SOLUTION NMR |
| 1HP3 | A | OMEGA-ATRACOTOXIN-HV2A | 32 | SS | 3 | 3 | Natural | Unknow | SOLUTION NMR |
| 1HP9 | A | KAPPA-HEFUTOXIN 1 | 22 | SS | 2 | 2 | Natural | Unknow | SOLUTION NMR |
| 1HQQ | E;F;G;H | STREPTAVIDIN | 14 | SS | 2 | - | Natural | Streptomyces Avidinii | X-RAY DIFFRACTION |
| 1HRL | A | PARALYTIC PEPTIDE I | 23 | SS | 1 | 1 | Natural | Unknow | SOLUTION NMR |
| 1HTX | A | ALPHA-AMYLASE INHIBITOR AAI | 32 | SS | 3 | 3 | Natural | Amaranthus Hypochondriacus | SOLUTION NMR |
| 1HUI | A | INSULIN | 21 | SS | 1 | 1 | Natural | Homo Sapiens | SOLUTION NMR |
| 1HVW | A | OMEGA-ATRACOTOXIN-HV1A | 25 | SS | 3 | 3 | Natural | Unknow | SOLUTION NMR |
| 1HVZ | A | THETA DEFENSIN 1 | 18 | SS | 4 | 3 | Natural | Unknow | SOLUTION NMR |
| 1HXL | C;D | STREPTAVIDIN | 14 | SS | 2 | - | Natural | Unknow | X-RAY DIFFRACTION |
| 1HXZ | C;D | STREPTAVIDIN | 14 | SS | 2 | - | Natural | Unknow | X-RAY DIFFRACTION |
| 1HY2 | E;F;G;H | STREPTAVIDIN | 12 | SS | 2 | - | Natural | Unknow | X-RAY DIFFRACTION |
| 1HY9 | A | COCAINE AND AMPHETAMINE REGULATED TRANSCRIPT PROTEIN | 41 | SS | 3 | 3 | Natural | Homo Sapiens | SOLUTION NMR |
| 1HYK | A | AGOUTI RELATED PROTEIN | 46 | SS | 5 | 5 | Natural | Unknow | SOLUTION NMR |
| 1I25 | A | HUWENTOXIN-II | 37 | SS | 3 | 3 | Natural | Ornithoctonus Huwena | SOLUTION NMR |
| 1I26 | A | PTU-1 | 34 | SS | 3 | 3 | Natural | Peirates Turpis | SOLUTION NMR |
| 1I2U | A | DEFENSIN HELIOMICIN | 44 | SS | 3 | 3 | Natural | Heliothis Virescens | SOLUTION NMR |
| 1I2V | A | DEFENSIN HELIOMICIN | 44 | SS | 3 | 3 | Natural | Heliothis Virescens | SOLUTION NMR |
| 1I6Y | A | ION-SELECTIVE LIGAND A1 | 13 | SS | 1 | 1 | Natural | Unknow | SOLUTION NMR |
| 1I8E | A | ION-SELECTIVE LIGAND A22 | 13 | SS | 2 | 2 | Natural | Unknow | SOLUTION NMR |
| 1I8X | A | GRANULIN-1 | 30 | SS | 2 | 2 | Natural | Unknow | SOLUTION NMR |
| 1I8Y | A | GRANULIN-1 | 28 | SS | 2 | 2 | Natural | Unknow | SOLUTION NMR |
| 1I93 | A | ION-SELECTIVE LIGAND D16 | 13 | SS | 1 | 1 | Natural | Unknow | SOLUTION NMR |
| 1I98 | A | ION-SELECTIVE LIGAND D18 | 13 | SS | 1 | 1 | Natural | Unknow | SOLUTION NMR |
| 1IB9 | A | TRYPSIN INHIBITOR II | 34 | SS | 3 | 3 | Natural | Momordica Cochinchinensis | SOLUTION NMR |
| 1IC9 | A | TH10AOX | 29 | SS | 1 | 1 | Non-natural | Synthetic Construct | SOLUTION NMR |
| 1ICA | A | INSECT DEFENSIN A | 40 | SS | 3 | 3 | Natural | Protophormia Terraenovae | SOLUTION NMR |
| 1ICL | A | TH1OX | 29 | SS | 1 | 1 | Non-natural | Unknow | SOLUTION NMR |
| 1ICO | A | TH10BOX | 29 | SS | 1 | 1 | Non-natural | Unknow | SOLUTION NMR |
| 1IE6 | A | IMPERATOXIN A | 33 | SS | 3 | 3 | Natural | Unknow | SOLUTION NMR |
| 1IEN | A | PROTEIN TIA | 20 | SS | 2 | 2 | Natural | Unknow | SOLUTION NMR |
| 1IEO | A | PROTEIN MRIB-NH2 | 14 | SS | 2 | 2 | Non-natural | Unknow | SOLUTION NMR |
| 1IKF | C | IGG1-KAPPA R45-45-11 FAB (LIGHT CHAIN) | 11 | H2T | 1 | - | Non-natural | Tolypocladium Inflatum | X-RAY DIFFRACTION |
| 1IM1 | A | ALPHA-CONOTOXIN IM1 | 12 | SS | 2 | 2 | Natural | Conus Imperialis | SOLUTION NMR |
| 1IM7 | A | GP41-PARENT PEPTIDE ACE-ILE-TRP-GLY-CYS-SER-GLY-LYS-LEU- ILE-CYS-THR-THR-ALA | 14 | SS | 1 | 1 | Natural | Unknow | SOLUTION NMR |
| 1IMI | A | PROTEIN (ALPHA-CONOTOXIN IMI) | 13 | SS | 2 | 2 | Natural | Conus Imperialis | SOLUTION NMR |
| 1IMW | A | IGFBP-1 ANTAGONIST | 16 | SS | 1 | 1 | Natural | Unknow | SOLUTION NMR |
| 1IN2 | A | IGFBP-1 ANTAGONIST | 16 | Sidechain | 1 | - | Natural | Homo Sapiens | SOLUTION NMR |
| 1IOG | A | PROTEIN (INSULIN PRECURSOR) | 21 | SS | 1 | 1 | Natural | Homo Sapiens | SOLUTION NMR |
| 1IOH | A | PROTEIN (INSULIN PRECURSOR) | 21 | SS | 1 | 1 | Natural | Homo Sapiens | SOLUTION NMR |
| 1IRR | A | PARALYTIC PEPTIDE | 23 | SS | 1 | 1 | Natural | Unknow | SOLUTION NMR |
| 1IVA | A | OMEGA-AGATOXIN-IVA | 48 | SS | 4 | 4 | Natural | Agelenopsis Aperta | SOLUTION NMR |
| 1IXA | A | EGF-LIKE MODULE OF HUMAN FACTOR IX | 39 | SS | 3 | 3 | Natural | Homo Sapiens | SOLUTION NMR |
| 1IXT | A | SPASMODIC PROTEIN TX9A-LIKE PROTEIN | 27 | SS | 3 | 3 | Natural | Unknow | SOLUTION NMR |
| 1IYC | A | SCARABAECIN | 36 | SS | 1 | 1 | Natural | Unknow | SOLUTION NMR |