Ras Pathway. Ras is a membrane-associated guanine nucleotide-binding protein that is normally activated in response to the binding of extracellular signals, such as growth factors, RTKs (Receptor Tyrosine Kinases), TCR (T-Cell Receptors) and PMA (Phorbol-12 Myristate-13 Acetate).
Sicily Description. Sicily is Italy's largest island and the largest island in theMediterranean Sea. It's also a geographical and political region of Italy, famed for its beautiful beaches, cuisine, and fascinating history.
Italy has twenty geopolitical regions, Sicily being the largest in area at 25,711 square kilometers, though Lombardy (around Milan), Lazio (Rome region) and Campania (Naples) have higher populations and much greater population densities. Sicily's parliament is the Regional Assembly, presided by a President (Speaker). However, Sicily also has a Regional President (Governor). In a poetic sense, they are sometimes described as the successors to Sicily's medieval kings and baronial parliaments, and their offices and chambers are housed in and around the Norman Palace, but the comparison is tenuous indeed.