| Interleukin-7 receptor subunit alpha | 51.579 | UniProtKB |
| Invariant natural killer T-cell | 1 | Found via general search |
| IP-10 [Interferon gamma-induced Protein 10] | 10.88 | Found via general search |
| Iron | 0.05584 | UniProtKB |
| Kallikrein 8 | 28 | Found via general search |
| Keratin, type I cytoskeletal 19 | 44.106 | UniProtKB |
| Keratinocyte growth factor | 19 | Found via general search |
| Keratocan | 40.509 | UniProtKB |
| Klotho | 116.181 | UniProtKB |
| Kynurenine | 0.208 | Found via general search |
