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Paradigm switching in the germinal center

Antigen receptor genes are assembled by a sequence of lineage-specific recombinatorial events, in which DNA breaks must be properly repaired to ensure cell survival and further developmental maturation. B lymphocytes, it seems, use multiple unique pathways to repair their DNA.

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Figure 1: Parallels between two DNA rearrangements occurring at the Igh locus: V(D)J recombination (left) rearranges V, D and J segments to encode the variable region of the immunoglobulin molecule, whereas CSR (right) rearranges a mature immunoglobulin variable region with one of several immunoglobulin constant (C) regions.

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Posey, J., Brandt, V. & Roth, D. Paradigm switching in the germinal center. Nat Immunol 5, 476–477 (2004). https://doi.org/10.1038/ni0504-476

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