- A Sorangium cellulosum (myxobacterium) gene cluster for the biosynthesis of the macrolide antibiotic soraphen A: cloning, characterization, and homology to polyketide synthase genes from actinomycetes. Schupp, T., Toupet, C., Cluzel, B., Neff, S., Hill, S., Beck, J.J., Ligon, J.M. J. Bacteriol. (1995)