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This process made cells spread out on the surface of culture plates, in a similar way to cancer cells moving out from a tumour.
BBC: NEWS | Health | Molecule 'helps cancer to spread'
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But Maggie Gallagher, an advocate who writes extensively against gay marriage, said the strategies could have a chilling effect on the democratic process and surely will spread as long as organizers are effective in intimidating voters.
FORBES: Gay rights activists outing their opponents' political orientation
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And if later in the process they find themselves spread hither and thither in different states, talking to voters only on television, here they are real live politicians going about modern-day politics using old-fashioned tools: stump speeches, hokey fund raisers, dinners in diners.
CNN: Hot politics on cold days