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After the exposure , cell viability using ( 3 - ( 4 , 5 - dimethylthiazol - 2 - yl ) - 2 , 5 - diphenyltetrazolium bromide ) and neutral red uptake assays and morphological changes in HepG2 cells were studied .
 Chemical: 3 - ( 4 , 5 - dimethylthiazol - 2 - yl ) - 2 , 5 - diphenyltetrazolium bromide; Chemical: neutral red
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: 3 - ( 4 , 5 - dimethylthiazol - 2 - yl ) - 2 , 5 - diphenyltetrazolium bromide; Chemical: neutral red