Chemokine CCL21 is a ligand of chemokine receptor (CCR)7. It is constitutively expressed at high level in secondary lymphoid organs (thymus, lymph node, spleen).

• 趋化因子CCL21是趋化因子受体(CCR)7的一个配体。 它在次级淋巴器官(胸腺、淋巴结、脾脏)中组成性高表达。