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Structures of representative signaling molecules in Actinobacteria. The A-factor of Streptomyces griseus, the GBLs of S. coelicolor (SCB1, SCB2, and SCB3), MMFs of S. coelicolor which are structurally distinct sharing a common 2-alkyl-4-hydroxymethylfuran-3-carboxylic acid core structure but differ in the identity of the C2 alkyl group. The C4-homoserine lactone of Pseudomonas aeruginosa is shown for comparison. Adapted from Willey and Gaskell (2011).
