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Leukocyte receptors, their corresponding ligands, and their allowed behaviors
| Leukocyte Receptor | Surface Receptor-Ligand | Behaviors |
| PSGL-1 | P-Selectin | Rolling |
| VLA-4 Integrin | VCAM-1 | Rolling, Firm Adhesion |
| CXCR-2 Chemokine Receptor | GRO-α Chemokine | Activation |
These three receptor-ligand pairs were chosen because together they are sufficient for enabling leukocytes to roll, become activated, and firmly adhere in vitro.
