Used for the rapid and efficient isolation of CD19+ B cells from human peripheral blood mononuclear cells (PBMCs) or other lymphoid tissues. The kit employs magnetic bead-based positive selection technology, enabling high-purity B cell enrichment for downstream applications such as flow cytometry, functional assays, cell culture, and immunological research. Ideal for studies involving B cell activation, differentiation, and antibody production. The isolated cells remain viable and unlabeled, making them suitable for both short-term and long-term experiments. Commonly used in immunotherapy development, especially in CAR-T cell research targeting B cell malignancies.