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In our attempt to identify chemokine receptors that are related to Burkitt's lymphoma receptor 1 ( BLR1 ) and are expressed in activated lymphocytes we used RT-PCR resulting in the isolation of a cDNA encoding a seven transmembrane receptor termed BLR2 .
 protein: BLR1; protein: BLR2; protein: seven transmembrane receptor; cell type: activated lymphocytes; protein: chemokine receptors; protein: Burkitt's lymphoma receptor 1
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: BLR1; protein: BLR2; protein: seven transmembrane receptor; cell type: activated lymphocytes; protein: chemokine receptors; protein: Burkitt's lymphoma receptor 1