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Addition of a highly enriched preparation of OTF-1 made from one of these pre-B cells or from HeLa cells specifically stimulated in vitro transcription of an immunoglobulin gene .
 protein: OTF-1; cell line: pre-B cells; DNA: immunoglobulin gene; cell line: HeLa cells
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:
 protein: OTF-1; cell line: pre-B cells; DNA: immunoglobulin gene; cell line: HeLa cells