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The human IL-16 gene consists of seven exons and six introns .
 DNA: exons; protein: IL-16; DNA: introns; DNA: human IL-16 gene
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: exons, IL-16, introns, human IL-16 gene 
Answer:
 DNA: exons; protein: IL-16; DNA: introns; DNA: human IL-16 gene