Abstract
Most B cells in peripheral lymphoid tissues are produced in adult bone marrow and are referred to as B-2 cells. A minor B-cell population, known as the B-1-cell population, that is mainly involved in innate immune responses has been identified in mice. In contrast to B-2 cells, B-1-cell progenitors are produced most efficiently during fetal life. This Review focuses on the emergence of B-1-cell potential during embryogenesis, summarizes recent advances in the delineation of a fetal B-1-cell-specified progenitor, and discusses the possibility that distinct fetal and adult B-cell developmental programmes might be operative in humans.
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