单细胞测序 抗体的亲和力鉴定 流式分离出 Public antibody 抗原筛选 单细胞 clonotypes ScRNA-seq YYYY 9000 FACS sort Antigen-labeled Cell Oil ScVDJ-seq antibodies 细胞表面标记筛选 收集免疫B细胞 LIBRA-seq Functional characterization 抗体的功能鉴定