Rio de Janeiro: A substance extracted from rattlesnake venom could raise survival hopes among patients with skin cancer, according to experiments performed by Brazilian researchers.Chromatin, a protein isolated from the venom of the South American snake, increased the survival rate of rats with skin cancer by up to 70 percent, the Butantan Institute reported Thursday.The protein also helped to significantly retard the development of tumours and even to completely inhibit their formation, according to Butantan, an institute linked to the health department of Sao Paulo state.The researchers heading the unprecedented study discovered that the protein is able to kill cells but its toxic action is exclusively limited to melanoma cells, meaning that it does not affect an organism`s other cells.
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