British Prime Minister David Cameron (C) looks through a microscope at regenerating cells, part of a Parkinson's disease research project, while Israel's President Shimon Peres stands next to him, during their meeting in Jerusalem March 12, 2014. Cameron denounced Iran's government as a "despotic regime" in a speech to Israel's parliament on Wednesday and accused Tehran of making "despicable" efforts to arm Palestinian militants. REUTERS/Dan Balilty/Pool (JERUSALEM - Tags: POLITICS)