The high-functioning “cells” that Cronin has built are constructed from large polyoxometalates derived from a range of metal atoms, like tungsten.

The high-functioning “cells” that Cronin has built are constructed from large polyoxometalates derived from a range of metal atoms, like tungsten. 
http://www.utaot.com/2013/01/01/scientist-creates-lifelike-cells-out-of-metal/