5673
E2F-1 blocks terminal differentiation and causes proliferation in transgenic megakaryocytes .
 cell type: transgenic megakaryocytes; protein: E2F-1
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: transgenic megakaryocytes, E2F-1 
Answer:
 cell type: transgenic megakaryocytes; protein: E2F-1