title: Heavy chain
text: # 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
  