Biologically derived, nanoscale gas vesicles can be used as ultrasound contrast agents.
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Borden, M., Sirsi, S. Better contrast with vesicles. Nature Nanotech 9, 248–249 (2014). https://doi.org/10.1038/nnano.2014.68
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DOI: https://doi.org/10.1038/nnano.2014.68
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