Polycythemia Vera. This slow-developing disease occurs when bone marrow produces too many red blood cells, which can lead to thickening of the blood. The condition is thought to be caused in part by a mutation in a gene called JAK2, which regulates the production of various types of blood cells, keeping them in proper balance.
Hilly landscapes and cathedrals dominate much of Andalusia, Spain. The Iberian Peninsula, predominately occupied by the European countries of Spain and Portugal, lies in southwestern Europe. With an area of 582,000 square kilometers, its is the third largest peninsula in the continent.
Spain (Spanish: EspaÃ±a [esËpaÉ²a]), officially the Kingdom of Spain (Spanish: Reino de EspaÃ±a), is a sovereign state located on the Iberian Peninsula in southwestern Europe, with two large archipelagoes, the Balearic Islands in the Mediterranean Sea and the Canary Islands off the North African Atlantic coast, two cities, Ceuta and Melilla, in the ...