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E. coli P4 induces NET formation by bovine neutrophils. Sytox Orange DNA staining of noninfected (A) or E. coli P4-infected (B to D) neutrophils. NET formation (white arrows) induced by GFP-expressing E. coli P4 cells (yellow arrows), which are seen trapped in NETs. Scale bars are 200 μm (A and B) and 50 μm (C and D).
