Hormone-like regulatory effector

During the evolution of living systems and the interdependent coevolution of new metabolic and regulatory qualities some so-called secondary products have acquired a physiological role not only for intra- or inter-specific interactions of individuals (e.g. pheromones, phytoalexins etc.) but also for the interaction between cells of the producing organisms themselves (e.g. hormones and hormone-like regulatory effectors) (Ref. 1). Thus, as indicated by the pathways of biosynthesis and metabolism, the plant hormones so far... 

In microorganisms hormone-like regulatory effectors are found scarcely. Examples, however, are ... 

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