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. 2016 Feb 29;6:22321. doi: 10.1038/srep22321

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Copyright © 2016, Macmillan Publishers Limited

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(a) Schematic illustration outlining compositionally-distinct radial regions of the ferritin protein. (b) Proxygram composition profiles for Fe, FePO₂, P, Na, N, and C from the ferritin embedded in lowicryl specimens. Corresponding regions of the mass spectra are shown to the right of each profile for the resin embedded with ferritin (black) and the pure lowicryl (red). The composition profiles taken from the Fe₃O₄ specimen are shown as the dashed curves.