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In animal experiment , GCR of spleen lymphocytic cell was also measured in 18 aged rats and 9 young rats .
 protein: GCR; cell type: spleen lymphocytic cell
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: GCR; cell type: spleen lymphocytic cell