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\bibitem{Yusupov_etal2018} {\textquotedblleft}\textit{Impact of plasma oxidation on structural features of human epidermal growth factor}{\textquotedblright}. Yusupov M, Lackmann J-W, Razzokov J, Kumar S, Stapelmann K, Bogaerts A, Plasma processes and polymers \textbf{15}, 1800022 (2018).   http://doi.org/10.1002/ppap.201800022

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