Remote-control nanoparticles deliver drugs directly into tumors

Here, dark gray nanoparticles carry different drug payloads (one red, one green). A remotely generated five-minute pulse of a low-energy electromagnetic field releases the green drug but not the red. A five-minute pulse of a higher-energy electromagnetic field releases the red drug, which had been tethered using a DNA strand twice as long as the green tether, as measured in base pairs. Image courtesy / Bhatia/von Maltzahn, MIT. Derfus, UCSD