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Nostocyclopeptides A1 and A2 are novel cyclic heptapeptides produced by the terrestrial cyanobacterium Nostoc sp. ATCC53789 that possess a unique imino linkage in the macrocyclic ring. Herein we report the cloning, sequencing, annotation, and biochemical analysis of the 33-kb nostocyclopeptide (ncp) biosynthetic gene cluster, which includes seven open reading frames predicted to be involved in the...
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