GO:0072519

GO:0043298

GO:0044404

GO:0085031

A process carried out by gene products in an organism that enable the organism to engage in a symbiotic relationship, a more or less intimate association, with another organism. The various forms of symbiosis include parasitism, in which the association is disadvantageous or destructive to one of the organisms; mutualism, in which the association is advantageous, or often necessary to one or both and not harmful to either; and commensalism, in which one member of the association benefits while the other is not affected. However, mutualism, parasitism, and commensalism are often not discrete categories of interactions and should rather be perceived as a continuum of interaction ranging from parasitism to mutualism. In fact, the direction of a symbiotic interaction can change during the lifetime of the symbionts due to developmental changes as well as changes in the biotic/abiotic environment in which the interaction occurs. Microscopic symbionts are often referred to as endosymbionts.

GO:0044403

biological_process

symbiotic interaction between host and organism

symbiotic interaction between organisms

symbiotic process

symbiotic interaction

symbiotic interaction between species

symbiosis

symbiosis, encompassing mutualism through parasitism

GO:0044403

biological process involved in symbiotic interaction

parasitism

host-pathogen interaction

commensalism