3828
The most extensively studied phenomenon is the progressive decline in the proliferative capacities of T lymphocytes with aging.
 cell type: T lymphocytes
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: T lymphocytes 
Answer:
 cell type: T lymphocytes