Secondary metabolites are organic compounds that are not directly involved in the normal growth, development, or reproduction of organisms.[1] Unlike primary metabolites, absence of secondary metabolities does not result in immediate death, but rather in long-term impairment of the organism's survivability, fecundity, or aesthetics, or perhaps in no significant change at all. Secondary metabolites are often restricted to a narrow set of species within a phylogenetic group.[2] Secondary metabolites often play an important role in plant defense against herbivory[3] and other interspecies defenses.
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