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3.
Interleukin - 2 is a lymphokine synthesized and secreted primarily by t lymphocyte or t helper lymphocytes that have been activated by stimulation with certin antigens or mitogens . it is one of the important t cell growth factors . because of its key role in immune response , it is always a center in the study of cytokines . compared with human and mammalian , the study of chicken il - 2 is very slowly 白细胞介素- 2 ( interleukin - 2 ， il - 2 )主要是在促有丝分裂素或特异性抗原刺激下，由t淋巴细胞或t淋巴细胞系产生的一种淋巴因子，是机体主要的t细胞生长因子之一。由于il - 2具有的重要免疫调节功能， il - 2一直是细胞因子研究中的热点之一。
