Draft Genome Sequence and Annotation of the Obligate Bacterial Endosymbiont , Causative Agent of the Killer Phenotype in .

is an obligate endosymbiont living in the cytoplasm of causes the so-called killer trait, eliminating intraspecific competitors of its host when released into the medium by the concerted action of the unusual protein structure R-body (refractile body) in addition to an as-yet-unknown toxin.