Assertion: lymphoblast's cell | /r/CapableOf | upregulate the recombination genes
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Source sentences:
text: At the DN2 stage (CD44+CD25+), cells upregulate the recombination genes RAG1 and RAG2 and re-arrange the TCRβ locus, combining V-D-J and constant region genes in an attempt to create a functional TCRβ chain.