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Synchrotron X-ray microdiffraction from a 2- by 5-µm spot focused on pili of the G. sulfurreducens wild-type strain (A), an Aro5 strain expressing modified PilA lacking aromatic amino acids required for pilus conductivity (B), and a control strain constructed in the same manner as Aro5, but with the wild-type PilA sequence, yielding conductive pili (C). Arrows in panels A and C point to the diffraction rings. a.u., arbitrary units.
