7593
Mutations in the alpha and sigma - 70 subunits of RNA polymerase affect expression of the mer operon .
 GENE: alpha and sigma - 70 subunits of RNA polymerase; GENE: mer operon
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: alpha and sigma - 70 subunits of RNA polymerase, mer operon 
Answer:
 GENE: alpha and sigma - 70 subunits of RNA polymerase; GENE: mer operon