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(A) Organization of the ncz cluster of “S. carzinostaticus” and (B) modular organization of type I PKS ORF4, ORF5, and ORF6. Abbreviations for restriction sites used for mapping: Ba, BamHI; Bg, BglII; EI, EcoRI; EV, EcoRV; N, NotI; S, SacI; X, XhoI. The slash indicates a putative nonfunctional domain.
