4280
The Tax protein of human T-cell lymphotropic virus type 1 ( HTLV-1 ) is a 40-kDa transcriptional activator which is critical for HTLV-1 gene regulation and virus-induced cellular transformation .
 protein: Tax protein; protein: 40-kDa transcriptional activator
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: Tax protein, 40-kDa transcriptional activator 
Answer:
 protein: Tax protein; protein: 40-kDa transcriptional activator