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. 2020 Feb 26;11:1049. doi: 10.1038/s41467-020-14877-x

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© The Author(s) 2020

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Fig. 5 — a PAGE gel showing the protein ladder and two protein bands stained with Coomassie blue. Mass spectra showing the microdroplet digestion of b α-casein and c cytochrome c. Magenta asterisks denote the peptide fragments.