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Substrate selectivities of bacterial outer membrane porins
| Channel type | No. identified |
|---|---|
| Nonselective | 9 |
| Anions | 3 |
| Phosphate | 2 |
| Pyrophosphate | 1 |
| Cations | 4 |
| Heavy metals | 1 |
| Nucleotides | 1 |
| Nucleosides | 1 |
| Monosaccharides | 1 |
| Oligosaccharides | 2 |
| Fatty acids | 1 |
| Short-chain amides | 1 |
| Urea | 1 |
| Toluene | 1 |
| Drugs | 1 |
| Iron complexes | 2 |
| Vitamins and cofactors | 2 |
| Complex carbohydrates | 3 |
| Proteins | 6 |
