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Olufolasade Atoyebi, U.S. Naval Research Laboratory postdoctoral researcher, loads samples of tyrosine and disodium tyrosine powder into an X-ray Photoelectron Spectroscopy (XPS) plate in Washington, D.C. August 18, 2022. Atoyebi prepares the XPS plate in order to analyze the elemental composition and chemical states present in the samples. (U.S. Navy photo by Sarah Peterson)
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