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Olufolasade Atoyebi, U.S. Naval Research Laboratory postdoctoral researcher, inserts a sample of tyrosine and disodium tyrosine powder into the X-ray Photoelectron Spectroscopy (XPS) in Washington, D.C. August 18, 2022. The XPS allows a reseacher to determine the elemental composition and observe the chemical and electronic state of elements in a sample. (U.S. Navy photo by Sarah Peterson)
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