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Conventionally , four nominal allotypic variants , b4 , b5 , b6 and b9 have been shown to be co - dominantly expressed at the Ckappa1 gene locus .
 GENE: Ckappa1 gene locus
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Ckappa1 gene locus