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The effect of heat shock on the expression of the nuclear protooncogenes c-fos , c-jun , and c-myc was studied in human lymphoid cells .
 DNA: c-fos; DNA: nuclear protooncogenes; cell type: human lymphoid cells; DNA: c-myc; DNA: c-jun
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: c-fos; DNA: nuclear protooncogenes; cell type: human lymphoid cells; DNA: c-myc; DNA: c-jun