Igkappa allelic inclusion is a consequence of receptor editing.

Abstract excerpt

The discovery of lymphocytes bearing two light chains in mice carrying self-reactive antibody transgenes has challenged the "one lymphocyte-one antibody" rule. However, the extent and nature of allelically included cells in normal mice is unknown. We show that 10% of mature B cells coexpress both Igkappa alleles. These cells are not the result of failure in allelic exclusion per se, but arise through receptor...

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