Induction of MCETs by S aureus and P aeruginosa. HMC-1 cells were seeded on poly-L-lysine–coated glass slides, then infected with S aureus or P aeruginosa (MOI 1:25) for 6 hours and fixed with 4% paraformaldehyde and examined by FESEM. (A) P aeruginosa entrapped by MCETs (white arrows; bars are 10 μm for panel Ai and 2 μm for panel Aii). (B) S aureus entrapped by extracellular fibers produced by MCs (bars are 2 μm for panel Bi and 1 μm for panel Bii).