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Northern blot analysis of polyadenylated RNA purified from activated human B cells revealed a single mRNA transcript of approximately 2.3 kb.
 cell type: activated human B cells; RNA: polyadenylated RNA; RNA: single mRNA transcript
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:
 cell type: activated human B cells; RNA: polyadenylated RNA; RNA: single mRNA transcript