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In the present investigation, the effect of ciprofloxacin at supratherapeutic concentrations on immediate-early (<2 h) gene expression in primary human peripheral blood lymphocytes was studied with Northern blots .
 cell type: primary human peripheral blood lymphocytes
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: primary human peripheral blood lymphocytes 
Answer:
 cell type: primary human peripheral blood lymphocytes