Immunoglobulin light chain
（重定向自Immunoglobulin light chains）
![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.](/Images/godic/202502/09/AntibodyChains.svg1537.png")
![An antibody molecule. The two heavy chains are colored red and blue and the two light chains green and yellow. See also:](/Images/godic/202502/09/Antibody_IgG21537.png")
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.