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Following cotransfection of p53 - null EU - 4 cells with survivin promoter - luciferase constructs and either wt - p53 or different mut - p53 expression vectors , wt - p53 inhibited survivin promoter activity ; p53 - mediated inhibition could be abrogated by overexpression of murine double minute2 ( MDM2 ) protein .
 Anatomy: p53 - null EU - 4 cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
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Answer:
 Anatomy: p53 - null EU - 4 cells