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In addition, a new combination isoform containing Oct2a 's amino terminal insert ( exon 7a ) and Oct2b 's carboxy terminal insert ( exon 13 ) was found that created a novel large isoform, Oct2ab .
 exon 7a, Oct2b 's carboxy terminal insert, Oct2b, Oct2a, Oct2ab, Oct2a 's amino terminal insert, exon 13
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 exon 7a, Oct2b 's carboxy terminal insert, Oct2b, Oct2a, Oct2ab, Oct2a 's amino terminal insert, exon 13