Following multiple physiological variables or cell types in vivo requires specific probes. Microfabricated magnetic particles could produce such tuneable contrast agents for magnetic resonance imaging.
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Bowtell, R. Colourful future for MRI. Nature 453, 993–994 (2008). https://doi.org/10.1038/453993a
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DOI: https://doi.org/10.1038/453993a