以下为句子列表：
英文: They are currently developing an expression system containing the antibody gene, devoid of antibiotic selection markers, and integrating the system into the chromosome of lactic-acid bacteria, with the goal of achieving passive immunization at mucosal sur
中文: 他们正在开发一种含有抗体基因表达系统，无抗性选择标记而系统整合到乳酸菌染色体的体系，以实现粘膜表面的被动免疫。
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