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Finally , we report that immune effector cells catalyze selective damage in vitro to DNP - covered Hp in the presence of anti - DNP antibodies .
 Chemical: DNP; Chemical: DNP
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: DNP, DNP 
Answer:
 Chemical: DNP; Chemical: DNP