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Transmission electron microscopy of A. actinomycetemcomitans strains. Whole-mount negatively stained preparations of A. actinomycetemcomitans strains grown on solid medium were analysed by transmission electron microscopy. (a) Fimbriated clinical isolate (VT1257); (b) WT (VT1169); (c) morC mutant (VT1650); (d, e) WT (VT1169)/pKM2/flp1-tadV (KM611); (f) morC mutant/pKM2/flp1-tadV (KM612). The arrow indicates a fimbrial stub. Bar, 100 nm.
