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A cDNA clone , B4-2 , was isolated from a natural killer (NK) minus T cell subtractive library .
 DNA: natural killer (NK) minus T cell subtractive library; DNA: cDNA clone; DNA: B4-2
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: natural killer (NK) minus T cell subtractive library; DNA: cDNA clone; DNA: B4-2