Ngly absent from corynebacteria and many Micrococcales. The source of inositol for MSH biosynthesis in these organisms is not known. When present, inoA is generally adjacent to its regulatory gene (inoR; Zhang et al., 2012). A similar distribution across actinobacteria was found for the biosynthetic genes of other inositol derivatives such as phosphoinositides (a threegene cluster comprising SCO15