2364
It was previously shown that Vi antigen expression was regulated by a system similar to the rcs regulatory system involved in colanic acid synthesis in Escherichia coli .
 GENE: Vi antigen; GENE: rcs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Vi antigen; GENE: rcs