<span style="color: #222222;">Two American scientists and a British researcher have won the Nobel Prize in Chemistry for evolution research. </span><br />'' <br />'' <span style="color: #222222;">Frances Arnold and George Smith are of the United States and Gregory Winter is British. </span><br />'' <br />'' <span style="color: #222222;">The Nobel jury said in Stockholm that the scientists have been awarded for harnessing the principles of evolution to develop proteins used to make everything from biofuels to pharmaceuticals.</span><br />''