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Transmission electron microscopy was performed using the FEI Tecnai G2 TEM and Formvar carbon-coated grids. Conventional electron microscopy was performed by staining the sample with 1% phosphotungstic acid. (A). The external surface of Filifactor alocis ATCC 35896 shows rudimentary markings and slender projections resembling pili (arrows). (B) Filifactor alocis clinical strain D-62D showing thick slimy outer cover with no external projections or rudimentary marks.
