CHICAGO (Reuters) - U.S. researchers have begun testing drugs using a microchip lined with living cells that replicates many of the features of a human lung, a technology that may one day help improve drug testing and reduce researchers' dependence on animal studies. In 2010, researchers at Harvard's Wyss Institute for Biologically Inspired Engineering developed the so-called lung-on-a-chip technology that mimics the function of air sacs called alveoli, which transfer oxygen through a thin membrane from the lung to the blood. ...{br}{br}View the Entire Article{br}