Assertion: antigen's structure | /r/MadeOf | two heavy chains
Facets:
Source sentences:
text: All antibodies share the same basic structure which consists of four polypeptide chains, two light chains (L chains) and two heavy chains (H chains), held together by disulfide bonds.
text: Antibodies may be present naturally, their specificity is determined through gene rearrangement or somatic replacement or may be synthesized in response to stimulus provided by the introduction of an antigen; antibodies are found in the blood and body fluids, although the basic structure of the molecule consists of two light and two heavy chains, antibodies may also be found as dimers, trimers, or pentamers.