A B cell superantigen-induced persistent "Hole" in the B-1 repertoire.

However, in the peritoneal cavity, a major anatomic residence of B-1 cells, neonatal SpA treatment resulted in a highly significant mean 78% reduction ( P = 0.0006) in the frequency of V H T15 transgene–expressing peritoneal B-1 cells (Mac-1 + B220 + ) (7.9 ± 1.1%, n = 7) compared with control treated mice (36.5 ± 3.2%, n = 6) ( Fig. 7 A).

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