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Organization of the pik cluster in S. venezuelae. Each arrow represents an ORF. The direction of transcription and relative sizes of the ORFs deduced from nucleotide sequence are indicated. The cluster is composed of four genetic loci: pikA, pikB (des), pikC, and pikR (see text and Table 2 for phenotype of the corresponding gene disruption mutants). Cosmid clones are denoted as overlapping lines.
