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For example dendritic cells ( DC ) can be found in colonies of GM-CSF-responsive bone marrow cells , and under experimental conditions are routinely expanded as a population in vitro from GM-CSF-responsive progenitor cells .
 dendritic cells, GM-CSF-responsive bone marrow cells, GM-CSF-responsive progenitor cells, DC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 dendritic cells, GM-CSF-responsive bone marrow cells, GM-CSF-responsive progenitor cells, DC