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We showed that , unlike the MV vaccine strains , rMV - SLAMblind used PVRL4 ( polio virus receptor - related 4 ) as a receptor to infect breast cancer cells and not the ubiquitously expressed CD46 .
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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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