555
The authors report the results of a series of toxicological tests conducted on plastic materials ( polyethylene ) activated with tetraphenylbutadiene ( TPB ) an additive recently proposed as a sensitizer capable of photodegrading plastic materials .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None