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The influence of beta - cryptoxanthin derived from mandarin on the proliferation of the stomach tumor cell line BGC - 823 was tested using MTT and cell count assay at 72 h and dose - response ( from 0 . 01 to 20 mu M ) .
 Chemical: beta - cryptoxanthin; Chemical: MTT
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: beta - cryptoxanthin; Chemical: MTT