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A novel B cell-restricted activity , required for high levels of octamer / Oct -dependent transcription from an immunoglobulin heavy chain (IgH) promoter , was detected in an in vitro system consisting of HeLa cell -derived extracts complemented with fractionated B cell nuclear proteins .
 DNA: immunoglobulin heavy chain (IgH) promoter; DNA: octamer; cell line: HeLa cell; DNA: Oct; protein: fractionated B cell nuclear proteins
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: immunoglobulin heavy chain (IgH) promoter; DNA: octamer; cell line: HeLa cell; DNA: Oct; protein: fractionated B cell nuclear proteins