Heavy chain
# Heavy chain

Heavy chain may refer to:

* Immunoglobulin heavy chain, a subunit of antibodies
   * Heavy-chain antibody, an antibody composed of heavy chains only
   * Heavy chain disease, a disease affecting antibody heavy chain production
* Myosin heavy chain, a subunit of myosin II
   * Myosin-heavy-chain kinase, an enzyme that catalyses the phosphorylation of myosin heavy chains
