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In the absence of tetracycline , GR mRNA and protein expression increased 2-3-fold, and cells expressed 48,000 receptors, a level nearly equivalent to that present in 6TG1.1 cells after 18 h of autoinduction.
 cell line: 6TG1.1 cells; RNA: GR mRNA
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: 6TG1.1 cells, GR mRNA 
Answer:
 cell line: 6TG1.1 cells; RNA: GR mRNA