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To make clear the roles of RA and RAR alpha in the normal hematopoiesis , I have introduced the construct of human RAR alpha ( hRAR alpha ) into murine bone marrow cells with retroviral vector , and selected infected cells with drug resistant marker ( Neo(r) ) cultured on the stroma cell line ( PA6-neo ), and analyzed the behavior of infected cells .
 cell line: PA6-neo; protein: hRAR alpha; DNA: drug resistant marker; protein: RAR alpha; cell line: stroma cell line; DNA: Neo(r); cell type: infected cells; cell type: murine bone marrow cells; protein: human RAR alpha; protein: RAR alpha
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: PA6-neo, hRAR alpha, drug resistant marker, RAR alpha, stroma cell line, Neo(r), infected cells, murine bone marrow cells, human RAR alpha, RAR alpha 
Answer:
 cell line: PA6-neo; protein: hRAR alpha; DNA: drug resistant marker; protein: RAR alpha; cell line: stroma cell line; DNA: Neo(r); cell type: infected cells; cell type: murine bone marrow cells; protein: human RAR alpha; protein: RAR alpha