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Physical map of the pilA locus for E. corrodens VA1-S1. Shaded and hatched boxes indicate sizes and positions of open reading frames as determined by sequence analysis. Arrows below the map designate mapped transcripts originating from the promoter upstream of pilA1. Flanking and internal restriction sites are shown for enzymes used in cloning and targeted mutagenesis. Bg, BglII; Bc, BclI; E, EcoRI; H, HindIII; S, SalI; Sm, SmaI.
