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目的：研究小牛胸腺免疫抑制提取物对体外培养细胞生长的作用。方法：采用3H－TdR自发掺入细胞实验．测定细胞生长情况。结果：该提取物能抑制EL4细胞及ConA诱导的小鼠胸腺细胞的生长，有量数关系。但对P815细胞株、K562细胞林细胞没有明显的抑制作用。结论：该提取物有抑制胸腺细胞生长的活性，但无细胞毒作用。
Objective: To study the effect of calf thymus immunosuppressive extract on cultured cell growth in vitro. Methods: 3H-TdR spontaneous incorporation of cells in the experiment. Cell growth was measured. Results: The extract can inhibit the growth of mouse thymocytes induced by EL4 cells and ConA. However, P815 cells, K562 cells, no significant inhibition of forest cells. Conclusion: The extract has the activity of inhibiting thymocyte growth but no cytotoxic effect.