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Following immunization of transgenic mice , hybrid molecules were isolated from B cell DNA which contained the transgene recombined with the endogenous IgH locus .
 GENE: endogenous IgH 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: endogenous IgH locus