<p> Proteins in this entry are almost always found adjacent to a plasmid stabilisation protein (<db_xref db="INTERPRO" dbkey="IPR007712"/>), which is the killing partner of an addiction module for plasmid stabilisation. Proteins in this entry, therefore, are putative addiction module antidote proteins. Some are encoded on plasmids or in prophage regions, but others appear to be chromosomal. A genome may contain several identical copies, for example four are found in <taxon tax_id="156889">Magnetococcus sp.</taxon> (strain MC-1). This entry is named after one member, <taxon tax_id="190650">Caulobacter crescentus CB15</taxon>.</p>