| Nutritional upgrading for omnivorous carpenter ants by the endosymbiont Blochmannia. |
| The Reb proteins constitute the R bodies which are secreted by killer paramecia and kill other paramecia not harboring this endosymbiont. |
| They acquired it very anciently by taking in a respiring bacterium as an endosymbiont. |
| Genes have recently been discovered in the nuclear genomes of these that appear to have been introduced by an ancestral endosymbiont. |
