Thymus and activation -regulated chemokine (TARC) , a CC chemokine, was identified as a selective chemoattractant for CC chemokine receptor 4 (CCR4) - expressing cells to ti-uss.

• 胸腺和活化调节趋化因子(thymus and activation-regulated chemokine，TARC)是CC型趋化因子，其受体是CC趋化因子受体4(CC chemokine receptor 4，CCR4)，在活化的Th2细胞上呈优势表达，它们共同作用使Th2细胞由血液迁移到一定的组织中。