]The immunoglobulin light chain is the small polypeptide subunit of an antibody (immunoglobulin).

A typical antibody is composed of two immunoglobulin (Ig) heavy chains and two Ig light chains.

In humans

There are two types of light chain in humans:
* kappa (?) chain, encoded by the immunoglobulin kappa locus (IGK@) on chromosome 2