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Transmission electron micrographs of G. sulfurreducens strains. (a) Control strain expressing wild-type pilin gene (insert: strain with pilin gene deleted). Heterologous expression of pilin genes from the following organisms: (b) F. sinusarabici, (c) C. nitroreducens, (d) D. alkaliphilus, (e) Ca. D. auxilii or (f) the synthetic Aro-5 sequence.
