14819
One signal can be delivered by the antigen-specific T-cell receptor , and the second signal is provided by the costimulatory molecule(s) delivered by the antigen-presenting cell .
 cell type: antigen-presenting cell; protein: antigen-specific T-cell receptor
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: antigen-presenting cell, antigen-specific T-cell receptor 
Answer:
 cell type: antigen-presenting cell; protein: antigen-specific T-cell receptor