Presence of general and siderophore-specific transporters by biosynthetic class and bacterial genus across the antiSMASH database. (A) ATP-dependent and ATP-independent (MFS) transporters are commonly associated with a variety of BGCs in the antiSMASH database across a wide range of genera. Each point is the percentage of a BGC class with a transporter within a particular genus. Each genus is colored by its Gram status, and genera with fewer than 20 BGCs of a particular class are excluded. (B) Siderophore-specific transporters are associated with few BGC classes in the antiSMASH database. Each point is the percentage of a BGC class with a transporter within a particular genus. Each genus is colored by its Gram status, and genera with fewer than 20 BGCs of a particular class are excluded.