2917
However , we were unable to detect cancer - related pathways in either wild - type or Xpa ( - / - ) p53 ( + / - ) exposed livers , which were previously found to be induced by B [ a ] P in Xpa ( - / - ) p53 ( + / - ) primary hepatocytes .
 Chemical: B [ a ] P
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: B [ a ] P