https://doi.org/10.1351/goldbook.13198
Larger of the two types of polypeptide chain found in immunoglobulin (Ig) molecules.
Note: Each heavy chain is linked by disulfide bonds to a light chain and to another, identical heavy chain. Each heavy chain consists of an Fc fragment and an Fd fragment. Heavy chains carry the antigenic determinants that differentiate the various immunoglobulin classes.