8099
The por gene has been expressed , for the first time , in anaerobically grown Escherichia coli behind the isopropyl - beta - D - thiogalactopyranoside - inducible tac promoter , resulting in the production of POR in its active form .
 GENE: por gene; GENE: tac promoter; GENE: POR
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: por gene, tac promoter, POR 
Answer:
 GENE: por gene; GENE: tac promoter; GENE: POR