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Sequence alignment of verified and putative SARP binding sites present in the valanimycin (vlm), actinorhodin (act), daunorubicin (dnr) and fredericamycin (fdm) biosynthetic gene clusters (Wietzorrek & Bibb, 1997; Chen et al., 2008). Conserved residues are indicated by asterisks, while spacings between the binding sites are indicated numerically.
