Prostaglandin D synthase (beta-trace protein): a molecular clock to trace the origin of REM sleep?

Eicosanoids: the molecules of evolution

The molecules of evolution constitute a response system linking the environment to the internal machinery of cells and are key factors in evolutionary disorders. They orchestrate such mechanisms of evolution as replication and reproduction, variation, inheritance, natural selection, heterochrony, neoteny, aging, recapitulation, metamorphosis, homology, paradox, and extinction. Eicosanoids fulfill these criteria.