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TO GO WITH AFP STORY BY MARC BURLEIGH - A laboratory worker shows a tube which keep dozens of ticks before exctracting saliva from them, at the molecular centre of Butantan Institute, in Sao Paulo, Brazil, on August 25, 2009. One of nature's repulsive little blood-sucking parasites, the tick, could yield a future cure for cancers of the skin, liver and pancreas, Brazilian researchers have discovered. They have identified a protein in the saliva of a common South American tick, Amblyomma cajennense, that apparently reduces and can even eradicate cancerous cells while leaving healthy cells alone. AFP PHOTO/Mauricio LIMA (Photo credit should read MAURICIO LIMA/AFP via Getty Images)