4870
The viral protein Tax was likely responsible for this higher level of class II gene transcription , as purified Tax was found to stimulate both genes when added to the uninfected cell extract or in reconstituted systems .
 DNA: class II gene; protein: purified Tax; protein: viral protein Tax
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: class II gene, purified Tax, viral protein Tax 
Answer:
 DNA: class II gene; protein: purified Tax; protein: viral protein Tax