1342
We describe the isolation and characterization of multiple cDNAs encoding mouse Oct2 from a mature B-cell line and we show that a variety of isoforms of this transcription factor is generated from a single gene by an alternative splicing mechanism .
 cell line: mature B-cell line; DNA: multiple cDNAs; protein: mouse Oct2; protein: transcription factor
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:
 cell line: mature B-cell line; DNA: multiple cDNAs; protein: mouse Oct2; protein: transcription factor