Barr body. Definition. noun. The small, dark-staining mass of inactive X chromosome within the nucleus of non-dividing cell. Supplement. Barr bodies are previously used as the basis for sex determination especially during the Olympics (see Barr test). Word origin: named after its discoverer Murray Llewellyn Barr, a Canadian anatomist who first identified the particle in the nucleus of neurons of female cats. Synonym: sex chromatin.
As of September 2011, there are nine Unified Combatant Commands as specified in Title 10 and the latest annual UCP. Six have regional responsibilities, and three have functional responsibilities.
The Air Force has 10 major commands. and two Air Reserve Components. (Air. Force Reserve Command is both a. majcom and an ARC.) As major subdivi-. sions of the Air Force, majcoms conduct. a major part of the serviceâs mission and. are directly subordinate to Hq. USAF. Major commands are organized on. a functional basis in the US and on a.