What is "igk@"

Immunoglobulin kappa locus, also known as IGK@, is a region on human chromosome 2 that contains genes for the kappa light chains of antibodies (or immunoglobulins).

In humans the κ chain is coded for by V (variable), J (joining) and C (constant) genes in this region. These genes undergo V(D)J recombination to generate a diverse repertoire of immunoglobulins.