Genomic DNA was extracted from sorted B-cell populations (pro-B for heavy chain and pre-B for light chain) with the genomic DNA extraction kit (QIAGEN). Quantitative analysis of VH-J558 and VH-7183 heavy chain and κ and λ light chain rearrangements were performed by Q-PCR using published primers61. Q-PCR was performed as stated above. Samples were normalized to Actb. Rearrangement frequencies were calculated as 2ΔCt with ΔCt=CtActb–CtIg.
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