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Nature Immunology 9, 345–346 (1 April 2008) | doi:10.1038/ni0408-345

New niches for B cells

Takashi Nagasawa

Bone marrow occupies the medullary cavities of bones throughout the skeleton. Diverse lineages of blood cells, including B cells and their precursors, arise from common hematopoietic stem cells and develop in a complex microenvironment in the densely cellular spaces in the bone marrow.