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Transmission electron microscopy of fimbriae. Whole-mount negatively stained preparations of A. actinomycetemcomitans strains grown on solid medium were analysed by transmission electron microscopy and inter-bacterial regions containing fimbriae were extracted. (a) Fimbriated clinical isolate (VT1257); (b, c) WT (VT1169)/pKM2/flp1-tadV (KM611). Bar, 50 nm.
