' Settler Yanon Netonel(ph) stopped his minivan to pick up one of the hitchhikers.

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Once home, launder your clothes and dry them on high heat for at least 30 minutes to kill all life stages of the potential hitchhikers.

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"We desperately need a method to distinguish which mutations are driving the tumor's growth and which are mere hitchhikers, " says Sloan-Kettering's Michor.

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