4642
In this study , we have examined the dose - response relationship for the formation of the above four products arising in calf thymus DNA exposed to gamma irradiation , photoactivated rose bengal , and two sources of peroxynitrite .
 Chemical: rose bengal; Chemical: peroxynitrite
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: rose bengal; Chemical: peroxynitrite