(A) Organization comparison of the WS9326A gene clusters in S. calvus ATCC 13382 and S. asterosporus DSM 41452; (B) NRPS domain organization are shown in the order for the WS9326A biosynthetic assembly line. Domain notation: C, condensation; A, adenylation; PCP, peptidyl carrier protein; E, epimerization; NMT, N-methyltransferase; TE, thioesterase.