5814
Human T-cell leukemia virus type 1 ( HTLV-1 ) Tax is thought to play a pivotal role in immortalization of T cells .
 cell type: T cells; 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: T cells, Tax 
Answer:
 cell type: T cells; protein: Tax