22804
In the absence of metabolic activation ( S9 ) , 3mM TEMPO produced significant cytotoxicity and marginal mutagenicity in the MLA ; in the presence of S9 , treatment of mouse lymphoma cells with 1 - 2mM TEMPO resulted in dose - dependent decreases of the relative total growth and increases in mutant frequency .
 Chemical: TEMPO; Chemical: TEMPO
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: TEMPO, TEMPO 
Answer:
 Chemical: TEMPO; Chemical: TEMPO