| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P05619 | Leukocyte elastase inhibitor; LEI; Serpin B1; | SERPINB1; ELANH2; | NP_001075416.1;XP_005603556.1;XP_005603557.1; | 379 | horse |
| P55101 | Inhibin alpha chain; | INHA; | NP_001075379.1; | 367 | horse |
| P55102 | Inhibin beta A chain; Activin beta-A chain; | INHBA; | NP_001075378.1; | 426 | horse |
| P01310 | Insulin; [Cleaved into: Insulin B chain; Insulin A chain]; | INS; | NULL | 86 | horse |
| P81634 | Pancreatic secretory trypsin inhibitor; Serine protease inhibitor Kazal-type 1; | SPINK1; PSTI; | NULL | 56 | horse |
| Q6H321 | Kallikrein-1E2; EC 3.4.21.35; Glandular kallikrein; HPK; | KLK1E2; | NP_001075362.1; | 261 | horse |
| P02758 | Beta-lactoglobulin-1; Beta-LG-1; Beta-lactoglobulin I; BLGI; | LGB1; | NP_001075962.1; | 180 | horse |
| P07380 | Beta-lactoglobulin-2; Beta-LG-2; Beta-lactoglobulin II; BLGII; Minor monomeric beta-lactoglobulin; | LGB2; | NP_001075963.1; | 181 | horse |
| P08896 | Alpha-lactalbumin B/C; Lactose synthase B protein; | NULL | NULL | 123 | horse |
| P08334 | Alpha-lactalbumin A; Lactose synthase B protein; | NULL | NULL | 123 | horse |
| Q8HZI9 | Laminin subunit gamma-2; Epiligrin subunit gamma; Kalinin subunit gamma; Laminin-5 subunit gamma; Nicein subunit gamma; | LAMC2; | NP_001075237.1; | 1190 | horse |
| P82615 | Latherin; Dander allergen Equ c 4/Equ c 5; allergen Equ c 4; | LATH; | NP_001075328.2; | 228 | horse |
| Q9TU09 | Leptin; Obesity factor; Fragment; | LEP; OB; | NULL | 145 | horse |
| P29183 | Pancreatic triacylglycerol lipase; PL; PTL; Pancreatic lipase; EC 3.1.1.3; Fragment; | PNLIP; | NP_001157421.1; | 461 | horse |
| P08751 | Lutropin/choriogonadotropin subunit beta; LSH-B/CG-B; Luteinizing hormone subunit beta; Lutropin/choriogonadotropin beta chain; | LHB; | NP_001184022.1; | 169 | horse |
| Q95LG1 | E-selectin; CD62 antigen-like family member E; Endothelial leukocyte adhesion molecule 1; ELAM-1; Leukocyte-endothelial cell adhesion molecule 2; LECAM2; CD antigen CD62E; | SELE; | NP_001075324.1; | 610 | horse |
| P11376 | Lysozyme C, milk isozyme; EC 3.2.1.17; 1,4-beta-N-acetylmuramidase C; | LYZ; | NULL | 129 | horse |
| P81710 | Lysozyme C, spleen isozyme; EC 3.2.1.17; 1,4-beta-N-acetylmuramidase C; Fragment; | NULL | NULL | 33 | horse |
| P83487 | Myelin basic protein; MBP; | MBP; | NULL | 172 | horse |
| P56951 | E3 ubiquitin-protein ligase Mdm2; EC 6.3.2.-; Double minute 2 protein; Edm2; p53-binding protein Mdm2; | MDM2; | NULL | 491 | horse |
