OK, folks THIS is interesting!
NANOGEL
Nanogel - Wikipedia, the free encyclopedia Nanogel is a term used to describe any mixture of
nano-sized particles or fibers with a gel, usually protein-based. They have the ability to cross into the cells of living organisms.
.....A highly hydrophilic fluorescent nanogel.....The cell absorbs water when colder and squeezes the water out as its internal temperature rises; the relative quantity of water masks or exposes the fluorescence of the nanogel.
Katinka