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Although a 13-kilobase-pair (kb) human c-fes transgene exhibits high levels of expression in mice , the sequences that confer myeloid-cell-specific expression of the human c-fes gene have not been defined.
 human c-fes gene, 13-kilobase-pair (kb) human c-fes transgene
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:
 human c-fes gene, 13-kilobase-pair (kb) human c-fes transgene