A transmissible that spreads like a virus may sound like part of the plot of an apocalyptic movie - but it is a reality in the animal kingdom.A study published last week found two strains of an ancient form of leukemia-like cancer that has been spreading silently among shellfish for centuries.The transmissible tumor cells float freely in the water like microscopic bacteria before being taken up by clams, multiplying and replicating in their host before escaping to attack others.
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