7528
In contrast, soluble factors secreted by stromal cells induce Tcell survival in a resting G0/G1 state .
 protein: soluble factors; cell type: stromal cells
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: soluble factors, stromal cells 
Answer:
 protein: soluble factors; cell type: stromal cells