25663
Unusually , both the E1 - b and E1 - b ' mRNA transcripts are generated from the use of a far upstream gene promoter , localized ~ 18 . 5 kb 5 ' - upstream of the EPHX1 protein - coding region .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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