Halocyamine

{{Short description|Antibiotic peptides}}

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| caption2 = Chemical structures of halocyamine A (top) and halocyamine B (bottom)

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Halocyamines are antibiotic peptides isolated from the ascidian Halocynthia roretzi.{{Cite journal|last=Azumi|first=K.|last2=Yokosawa|first2=H.|last3=Ishii|first3=S.|date=1990-01-09|title=Halocyamines: novel antimicrobial tetrapeptide-like substances isolated from the hemocytes of the solitary ascidian Halocynthia roretzi|journal=Biochemistry|volume=29|issue=1|pages=159–165|doi=10.1021/bi00453a021|issn=0006-2960|pmid=2322536}}