909
When the cells were incubated in medium containing 5 - fluorocytosine , cell survival ratio decreased dose dependently with 5 - fluorocytosine only after sonication treatment , suggesting this promoter could be utilized for gene expression control with ultrasound .
 Chemical: 5 - fluorocytosine; Chemical: 5 - fluorocytosine
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: 5 - fluorocytosine; Chemical: 5 - fluorocytosine