1196
Vaccinia virus ( VV ) is a potent immunogen , but the nature of VV proteins involved in the activation of the immune response of the host is not yet known .
 None
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:  
Answer:
 None