7242
CD4+ and CD8+ T cells differ in their beta-binding profiles , which may explain the more pronounced down-regulation of CD28 in senescent CD8+ T cells .
 protein: CD28; cell type: CD8+ T cells; cell type: CD8+ T 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: CD28, CD8+ T cells, CD8+ T cells 
Answer:
 protein: CD28; cell type: CD8+ T cells; cell type: CD8+ T cells