CD 抗原是白细胞及多种细胞在分化、成熟与活化过程中表达的细胞膜表面蛋白，作为细胞分型、功能鉴定与疾病诊断的重要标志物，在免疫与肿瘤研究中具有关键作用。CD 抗原重组蛋白通过基因工程技术，将目标 CD 抗原基因导入大肠杆菌、酵母、昆虫细胞或哺乳动物细胞等表达系统，经诱导表达、分离纯化制备而成，可保留天然构象与生物活性，常携带标签以方便纯化与检测。该类蛋白纯度高、批间稳定性好、可规模化生产，广泛用于免疫机制探索、抗体药物筛选、CAR‑T 等细胞治疗靶点验证及体外诊断试剂开发，是免疫学、生物医药与临床检测领域不可或缺的核心工具蛋白。
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