Comparative genetic analysis of the putative lankacidin biosynthetic cluster. Genes encoding protein involved in biosynthesis of lankacidin are represented as block arrows showing the direction of their transcription. Blue and pink arrows represent protein-coding genes putatively involved in lankacidin biosynthesis and transport, respectively. Green arrows represent protein-coding genes involved in pyrroloquinoline quinone (PQQ) synthesis. These genes are not present in the genome of Hahella chejuensis KCTC2396.