16743
Here we demonstrated that Rad9 was involved in nucleotide excision repair and loss of Rad9 led to defective removal of the UV - derived photoproduct 6 - 4PP ( 6 , 4 pyrimidine - pyrimidone ) and the BPDE ( anti - benzo ( a ) pyrene - trans - 7 , 8 - dihydrodiol - 9 , 10 - epoxide ) - DNA adducts in mammalian cells .
 Chemical: nucleotide; Chemical: 6 - 4PP; Chemical: 6 , 4 pyrimidine - pyrimidone; Chemical: BPDE; Chemical: benzo ( a ) pyrene - trans - 7 , 8 - dihydrodiol - 9 , 10 - epoxide
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: nucleotide; Chemical: 6 - 4PP; Chemical: 6 , 4 pyrimidine - pyrimidone; Chemical: BPDE; Chemical: benzo ( a ) pyrene - trans - 7 , 8 - dihydrodiol - 9 , 10 - epoxide