Figure 2

Cells, their receptors, and the interactions among cells. Panel (a) shows the cellular entities with their receptors: TCR and BCR are the antigen-receptors for the T and B lymphocytes, respectively; MDC, CCR7, and CXCR5 receptors are specific for the corresponding chemokines. S1P₁ is the receptor for the molecule S1P that controls the exit of lymphocytes from the lymph node. In panel (b), connectors among the entities indicate that they interact.