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Sequence alignment of the DEBS ACP domains. The protein sequences were obtained from the PKSDB (a Database of Modular Polyketide Synthases, www.nii.res.in/pksdb.html). Secondary structure elements from ACP2 structure are shown above the sequences. Several residues discussed in the text are numbered, including the conserved serine (Ser54) that serves as the phosphopantetheine attachment site.
