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1. IL-4 is a cytokine that plays a crucial role in immune responses.
IL-4是一种细胞因子，在免疫反应中起着关键作用。
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2. The study found that IL-4 can stimulate the production of antibodies against certain viruses.
研究发现，IL-4可以刺激产生针对某些病毒的抗体。
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3. IL-4 is often used as a treatment for autoimmune diseases, such as rheumatoid arthritis.
IL-4常用于治疗自身免疫性疾病，如类风湿关节炎。