B lymphoid cells are essential for the humoral immune response by producing a diverse range of antigen-specific antibodies. Antibody-mediated immunity is provided by two distinctive B cell lineages that diverge early in life. The better-known conventional, or B2, B cells provide adaptive immunity by producing high-affinity pathogen-specific antibodies, typically in a T cell-dependent manner. The pool of B2 cells is constantly replenished from hematopoietic stem and progenitor cells in the bone marrow [Ref.1]. B1a cells provid...
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