Assertion: lymphoblast's cell | /r/AtLocation | peritoneum
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text: These cells are designated CD5 B cells, or, more recently, B-1 B cells.47 B-1 B cells do not express other T-cell markers but do express all other pan-B-cell surface antigens.48 B-cell expression of CD5 can be modulated by various agents.49,50 B-1 B cells are found in umbilical cord blood,51 adult blood, the pleura and peritoneum, and all major secondary lymphoid organs but are rare in the marrow.52