Immunoglobulin light chain

Schematic diagram of a typical antibody showing two Ig heavy chains (blue) linked by disulfide bonds to two Ig light chains (green). The constant (C) and variable (V) domains are shown.
An antibody molecule. The two heavy chains are colored red, blue, and purple. The two light chains green and yellow. See also:[1]

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.