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We took advantage of our monoclonal model of germinal center B cell differentiation , IgM+ IgD+ CL-01 cells , to define the role of the I gamma 3 evolutionarily conserved sequence ( ECS ) in the germline transcriptional activation of the human C gamma 3 gene .
 evolutionarily conserved sequence, germline, I gamma 3, germinal center B cell, IgM+ IgD+ CL-01 cells, ECS, human C gamma 3 gene
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:
 evolutionarily conserved sequence, germline, I gamma 3, germinal center B cell, IgM+ IgD+ CL-01 cells, ECS, human C gamma 3 gene