Table 2.

Known tetrapeptides in Aspergillus species.

Tetrapeptide	Sequence	Linear/Cyclic	Ribosomally/Non-Ribosomally Synthesized	Aspergillus Species from Which Tetrapeptide Is Found	Biological Properties
Ustiloxin B [21]	Tyr–Ala–Ile–Gly	Cyclic	Ribosomally synthesized	A. flavus	Mitotic inhibitor
Asperterrestide A [22]	a ABA–3-OH-N-Me-Phe–Ile–Ala	Cyclic	Unknown	A. terreus	Inhibitory effects on influenza virus H1N1 and H3N2, cytotoxicity against human carcinoma cell lines
Aspergitide	Leu–Glu–Leu–Glu	Linear	Unknown	A. flavus, A. niger, A. fumigatus, A. terreus, A. nomius, A. tamarii	Unknown

^a ABA—Anthranilic acid.