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Comparison of cDNA and genomic sequences reveals a 4-exon structure characteristic of the FOS family of genes .
 cDNA, 4-exon structure, FOS family of genes, genomic sequences
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:
 cDNA, 4-exon structure, FOS family of genes, genomic sequences