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The pcm cluster is responsible for pepticinnamin E biosynthesis. (A) High-resolution mass spectrum of pepticinnamin E in the culture extract of A. bacterium OK006. In-source fragmentation ions were also observed (Figure S1). (B) Pepticinnamin E is produced by wildtype A. bacterium OK006, but not the pcm2 insertional mutants. The UV traces at A280nm of cell extracts are shown for (i) wildtype A. bacterium OK006 and (ii, iii) two independent pcm2::aprR mutant strains.
