| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| Q711G3 | Isoamyl acetate-hydrolyzing esterase 1 homolog; EC 3.1.-.-; Hypertrophic agonist-responsive protein B64; | Iah1; Harpb64; | NP_001094010.1; | 249 | rat |
| P12969 | Islet amyloid polypeptide; Amylin; Diabetes-associated peptide; DAP; | Iapp; | NP_036718.1;XP_006237676.1; | 93 | rat |
| P21743 | Insulin-like growth factor-binding protein 1; IBP-1; IGF-binding protein 1; IGFBP-1; | Igfbp1; Igfbp-1; | NP_037276.1; | 272 | rat |
| P12843 | Insulin-like growth factor-binding protein 2; IBP-2; IGF-binding protein 2; IGFBP-2; BRL-BP; | Igfbp2; Igfbp-2; | NP_037254.2; | 304 | rat |
| P15473 | Insulin-like growth factor-binding protein 3; IBP-3; IGF-binding protein 3; IGFBP-3; | Igfbp3; Igfbp-3; | NP_036720.2; | 292 | rat |
| P21744 | Insulin-like growth factor-binding protein 4; IBP-4; IGF-binding protein 4; IGFBP-4; | Igfbp4; Igfbp-4; | NP_001004274.1; | 254 | rat |
| P24594 | Insulin-like growth factor-binding protein 5; IBP-5; IGF-binding protein 5; IGFBP-5; | Igfbp5; Igfbp-5; | NP_036949.1; | 271 | rat |
| P35572 | Insulin-like growth factor-binding protein 6; IBP-6; IGF-binding protein 6; IGFBP-6; | Igfbp6; Igfbp-6; | NP_037236.1; | 226 | rat |
| Q6P734 | Plasma protease C1 inhibitor; C1 Inh; C1Inh; C1 esterase inhibitor; C1-inhibiting factor; Serpin G1; | Serping1; | NP_954524.1;XP_006234509.1; | 504 | rat |
| Q6RUG5 | Islet cell autoantigen 1-like protein; Amyotrophic lateral sclerosis 2 chromosomal region candidate gene 15 protein homolog; Ica69-related protein; | Ica1l; Als2cr15; | NP_955432.1; | 435 | rat |
| Q63054 | Islet cell autoantigen 1; 69 kDa islet cell autoantigen; ICA69; Islet cell autoantigen p69; ICAp69; p69; | Ica1; | NULL | 480 | rat |
| P27321 | Calpastatin; Calpain inhibitor; | Cast; | NP_001028887.1;NP_001028888.1;NP_445747.2; | 713 | rat |
| Q00238 | Intercellular adhesion molecule 1; ICAM-1; CD antigen CD54; | Icam1; Icam-1; | NP_037099.1; | 545 | rat |
| Q80VL0 | Interactor protein for cytohesin exchange factors 1; | Ipcef1; | NP_001164270.1; | 406 | rat |
| Q62726 | Serine/threonine-protein kinase ICK; EC 2.7.11.22; Intestinal cell kinase; MAK-related kinase; MRK; | Ick; | NP_620241.1; | 629 | rat |
| Q04753 | Methylosome subunit pICln; Chloride channel, nucleotide sensitive 1A; Chloride conductance regulatory protein ICln; I(Cln); | Clns1a; Icln Rcl1; | NP_113907.1;XP_006229854.1; | 236 | rat |
| Q9WVM4 | Protein-S-isoprenylcysteine O-methyltransferase; EC 2.1.1.100; Farnesyl cysteine carboxyl methyltransferase; FCMT; Isoprenylcysteine carboxylmethyltransferase; Prenylated protein carboxyl methyltransferase; PPMT; Prenylcysteine carboxyl methyltransferase;癷?癸 | Icmt; | NULL | 232 | rat |
| Q9R1T7 | Inducible T-cell costimulator; Activation-inducible lymphocyte immunomediatory molecule; CD antigen CD278; | Icos; Ailim; | NP_072132.1;XP_006245099.1;XP_006245100.1;XP_008765358.1; | 200 | rat |
| P41135 | DNA-binding protein inhibitor ID-1; Inhibitor of DNA binding 1; Inhibitor of differentiation 1; | Id1; Id-1; | NP_036929.2; | 164 | rat |
| P41137 | DNA-binding protein inhibitor ID-2; Inhibitor of DNA binding 2; Inhibitor of differentiation 2; | Id2; Id-2; | NP_037192.1; | 134 | rat |
