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. 2016 Aug 11;6:31525. doi: 10.1038/srep31525

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Copyright © 2016, The Author(s)

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(a) Cryo-SEM image after cryo-TOF-SIMS measurement and freeze-etching. Cryo-TOF-SIMS positive ion images of (b) total ion and (d) m/z 180 ion. (c) The overlay image of cryo-TOF-SIMS m/z 180 ion on the cryo-SEM image. Scale bar is 100 μm.