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ETEC strains grown on CFA agar were stained with uranyl acetate and visualized using TEM. Strains are as follows: Wildtype strain CVD30 (A); CVD30ΔcfaB (B); CVD30ΔlngA (C); CVD30ΔcfaBΔlngA (D); CVD30ΔcfaB(pGA2-CFA/I) (E); and CVD30ΔcfaBΔlngA(pGA2-CFA/I) (F). Scale bar size indicated in μM.
