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. 2017 May 30;12(5):e0178031. doi: 10.1371/journal.pone.0178031

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© 2017 Liu et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 5 — (a) Ultrasound imaging of three different SNBs and control MBs in vitro. 1×10⁴, 1×10⁵, 1×10⁶ and 1×10⁷ on the right side of the figure mean the bubble concentrations. (b) Quantitative analysis of the B-mode signal intensities of SNBs and control MBs at different concentrations.