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Janusköpfiges Protein Rheb: Das Signalprotein Rheb kommt in vielen Körperzellen, besonders im Gehirn vor. Es ist wichtig für Wachstumsprozesse – bei Zellstress zeigt es aber sein zweites Gesicht. In diesem Fall beschleunigt es den Tod der Zelle, auch Apoptose genannt. Die Abbildung zeigt eine gesunde (oben links) und eine apoptotische Nervenzelle (unten rechts). Die nun ermittelte NMR-Struktur des Rheb ist in Rot gezeigt.
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