21697
MTT assay revealed a significant and concentration - dependent cytotoxic effect of safranal on HeLa and MCF7 cell lines .
 Chemical: MTT
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: MTT 
Answer:
 Chemical: MTT