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Partial streptomycin biosynthesis cluster for genes flanking strA. (The figure is reproduced with permission from W. Piepersberg [11a].) The genes analyzed in this study are shaded. The bar represents distance in kilobases. 
, aminotransferase, biosynthesis; 
, presumed epimerase, biosynthesis; 
, amidinotransferase, biosynthesis; 
, phosphotransferase, streptomycin resistance; 
, regulation.
