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    Spatio-temporal images of growth-factor-induced activation of Ras and Rap1

    G proteins of the Ras family function as molecular switches in many signalling cascades1,2,3; however, little is known about where they become activated in living cells. Here we use FRET (fluorescent resonance en...

    Naoki Mochizuki, Shigeko Yamashita, Kazuo Kurokawa, Yusuke Ohba, Takeharu Nagai in Nature (2001)