Destruxin A is a cyclic hexadepsipeptide produced by fungus causing paralysis and death in insects.

β-Amanitin belongs to the family of amatoxins.Amanitins are made of bicyclic octapeptides.

Tautomycin may be used as a potent and specific protein phosphatase inhibitor.

Tentoxin is a naturally occurring phytotoxic cyclic tetrapeptide that is excreted by the fungi Alternaria alternata and Alternaria tenuis.

An antibiotic that inhibits protein tyrosine kinase. Herbimycin A is a potent inhibitor of angiogenesis.

Cytochalasin A reacts with sulfhydryls, and inhibits growth and glucose transport in Saccharomyces.

Firoin from Rhodothermus marinus, an extremolyte, may be used in the development of potential new formulations to enhance the stability of retroviral and adenoviral vectors.