Atomic force microscopy of P. avidum ATCC25577. A) Amplitude image of the overall morphology of the cells. Extracellular structures are clearly visible, extending out from the cell surface. B) and C) Height images showing extracellular structures collapsed onto the glass coverslip. The fiber-like structures measure 1-3 nm in diameter. X-Y scalebar = 1 μm, z scale is indicated by color.