What does AU4 stand for?

MLA style: "AU4." Acronym Finder . 2012. AcronymFinder.com 26 May. 2012 http://www.acronymfinder.com/Area-Under-pH-4-(AU4).html
Chicago style: Acronym Finder . S.v. "AU4." Retrieved May 26 2012 from http://www.acronymfinder.com/Area-Under-pH-4-(AU4).html
APA style: AU4. (n.d.) Acronym Finder. (2012). Retrieved May 26 2012 from http://www.acronymfinder.com/Area-Under-pH-4-(AU4).html

Area Under pH 4

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Unity Alliance (Nicaragua) Air University Associate-to-Baccalaureate Cooperative (US Air Force) Administrative Unit-Alarm Indication Signal African Union Inter-African Bureau for Animal Resources (Nairobi) Administrative Unit-Loss of Pointer Administrative Unit-New Data Flag African Union-Inter-African Bureau of Animal Resources absorbance units per metre arbitrary unit/secretory component of immunoglobulin A AutoIt3		Acceptable Use Agreement (various organizations) Agricultural Use Approval (Michigan) Air Traffic Control Unit Airspace America Under Attack American Ultrarunning Association American Unitarian Association American University of Armenia (Yerevan, Armenia) American Urological Association Another Useless Acronym Architecture Unifiée d'Applications (French: Unified Architecture Applications; computer applications)