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At the site of infection, immature dendritic cells acquire antigen and become activated, mature dendritic cells. However, before a mature dendritic cell can migrate and become able to enter the lymph nodes, it must express a specific homing receptor.

Which receptor must a mature dendritic cell express to be able to enter the lymph nodes?

A

CCR7.

B

CCR5.

C

CXCR3.

D

CCL21.

E

CCL19.

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