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However, the cytotoxic T lymphocyte ( CTL ) response to Ad could limit the effectiveness of such approaches.
 cell type: cytotoxic T lymphocyte; cell type: CTL
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: cytotoxic T lymphocyte, CTL 
Answer:
 cell type: cytotoxic T lymphocyte; cell type: CTL