2913
In vivo transcriptomics analysis revealed a limited gene expression response in mouse livers , but with a significant induction of DNA replication and apoptotic / anti - apoptotic cellular responses in Xpa ( - / - ) p53 ( + / - ) livers only .
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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:
 None