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OpaI GC and E. coli kill CEACAM1-expressing human B cells. CEACAM1-expressing B cells were treated with Opa− GC, OpaI GC, Opa− E. coli, or OpaI E. coli or not treated for 2.5 h as described in the legend to Fig. 2. Human B cells that bound annexin V-FITC or took up PI were regarded as dead cells. The percentage of dead cells is indicated on the right.
