| Antibody | Source | Manufacturer | Dilution | Clone |
| P-glycoprotein | Mouse | Dako | 1:100 | C494 |
| MRP1 | Mouse | Enzo LifeScience | 1:200 | MRPm6 |
| MRP2 | Mouse | Enzo LifeScience | 1:200 | M2III-6 |