Phenotypic and molecular characterization of human peripheral blood B-cell subsets with special reference to N-region addition and J kappa-usage in V kappa J kappa-joints and kappa/lambda-ratios in naive versus memory B-cell subsets to identify traces of receptor editing processes.

Abstract excerpt

We identified a population of IgM+IgD+ B-cells in the peripheral blood (PB) of humans that express somatically mutated V-region genes like classical class switched or IgM-only memory B-cells and comprise around 15% of PB B-cells in adults. Mutated IgM+IgD+ cells differ from unmutated naive IgM+IgD+ cells in that they express the CD27 cell surface antigen. In addition, a very small subset of IgD-only B-cells was...

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