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However , since multiple transcript variants could give rise to either the same or multiple protein isoforms from the same AKR gene we also propose to expand the nomenclature of the AKR protein superfamily , so that when a protein isoform is shown to be expressed and is functional it would be assigned the standard AKR name followed by a " period or full - stop " and a number for that unique isoform .
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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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