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.
November - January | February - March. The weather in Sicily in April, as the days grow longer, is warmer and dryer, and the bravest might even take a dip in the sea although the waters are still bracing. Eight hours of sunshine a day and an average high of 20 degrees await those holidaying in Sicily in April.