259
The IE2 gene product of human cytomegalovirus ( HCMV ) is one of a few viral regulatory proteins expressed immediately upon infection of the host cell .
 protein: IE2 gene product; cell type: host cell; protein: viral regulatory proteins
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: IE2 gene product, host cell, viral regulatory proteins 
Answer:
 protein: IE2 gene product; cell type: host cell; protein: viral regulatory proteins