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We have identified two human pre-B-cell lines that contain extremely low levels of OTF-2 yet still express high levels of steady-state immunoglobulin heavy-chain mRNA in vivo and efficiently transcribe an immunoglobulin gene in vitro.
 protein: OTF-2; DNA: immunoglobulin gene; RNA: steady-state immunoglobulin heavy-chain mRNA; cell line: human pre-B-cell lines; protein: immunoglobulin heavy-chain
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-2; DNA: immunoglobulin gene; RNA: steady-state immunoglobulin heavy-chain mRNA; cell line: human pre-B-cell lines; protein: immunoglobulin heavy-chain