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Northern blot analysis showed that TCDD treatment decreased steady state levels of CD19 mRNA by 67% in the IM-9 cell line .
 RNA: CD19 mRNA; cell line: IM-9 cell line
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: CD19 mRNA, IM-9 cell line 
Answer:
 RNA: CD19 mRNA; cell line: IM-9 cell line