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Here , we show that clinically relevant doses of ionizing radiation ( IR ) - induce cellular invasion of ErbB2 - expressing breast cancer cells , as well as MCF10A cells overexpressing ErbB2 .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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