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Subclones of R15 which reverted to kappa light chain production contained genomic deletions of R15ns and / or the surrounding intron .
 GENE: kappa light chain
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: kappa light chain