Abstract
K-Ras, H-Ras e N-Ras are part of a family of small GTPases which work as "molecular switches" converting the activation of membrane receptors into activation of intracellular signaling pathways such as the MAPK pathway. Gain-of-function mutations in Ras proteins are found in about to 20% of all human tumors, frequently leading to bad prognosis. Among other proteins whose activity has been…