controlled air oxygen content 4% O2, 20% CO2, 76%N2 2026-04-24T08:58:13Z 4% O2 and 20% CO2 in N2 GEO:GSE295589 PMID:41039100 This is any condition in which the main influencing factor is the level of carbon dioxide (20%), oxygen (4%), and nitrogen (76%) in the air surrounding the organism or breathed by the organism as part of the experiment. XCO:0001817 caripark experimental_condition_ontology