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The human IL-4 gene , of 10 kilobases , is composed of four exons and three introns .
 DNA: exons; DNA: introns; DNA: human IL-4 gene
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 DNA: exons; DNA: introns; DNA: human IL-4 gene