Seymour Johnson Air Force Base
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Breath of fresh air
Airman 1st Class Harry Boykin, 4th Aeromedical Dental Squadron bioenvironmental technician, adds phenol red into a water sample on Seymour Johnson Air Force Base, N.C., Sept. 24, 2009. Phenol red is an agent used to detect pH levels in water and is frequently used in cell biology laboratories. (U.S. Air Force photo/Senior Airman Ciara Wymbs)
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