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.
Sicily Weather in April. 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.