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Contact: Shawna Williams
Johns Hopkins Medicine


Caption: Nanosensors (green spheres) are composed of fat and L-arginine molecules, as well as separate indicator molecules that give off MRI-detectable and light signals when cells are alive. Nanosensors are enclosed in a hydrogel membrane along with liver cells (pink). Nutrients and other relatively small molecules (red) are able to travel across the hydrogel membrane to and from the bloodstream.

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