There is great potential if single cells can be tracked in vivo in the mammalian brain. Here, we demonstrate the applicability of microfabricated gold-coated iron particles for in vivo tracking of single-cell dynamics. These particles have a pure iron core as opposed to the more commonly used iron-oxide based particles. Following in situ labeling of neural precursor cells, we show that the migration of individual cells can be visualized in real-time.
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