4797
The selected STX aptamer sequence is provided here , making it available to any investigator for use in assay development for the detection of STX .
 Chemical: STX; Chemical: STX
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: STX; Chemical: STX