29275
The substrate specificities of OxyS and OxyR were shown to influence the relative ratio of 1 and tetracycline 2 .
 Chemical: tetracycline
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: tetracycline 
Answer:
 Chemical: tetracycline