14378
One of these activities was found to be a novel, less abundant, Rb- E2F complex.
 protein: E2F
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: E2F 
Answer:
 protein: E2F