Bacteriocins are compounds produced by bacteria showing antagonistic
property against micro organisms. They may also be termed as ‘bacteriocin-like
substances’ as they might be proteins or complexes of proteins, and they are not
active against the producer strain. The bacteriocin-like substances produced by the
domain Archaea are known as archeocins and are of two types, the halocins
produced by haloarchaea and the sulfolobicins produced by sulfolobous.