[A protein complex that consists of two heavy chains (gamma, alpha, delta, epsilon or mu). The larger of the two immunoglobulin chain types determines the immunoglobulin class (G, A, D, E or M, respectively). The heavy chain molecules exhibit the same structure and composition, which consists of constant, variable, and hypervariable regions. ( NCI )]
UMLS (NCI) C0021034 - Amino Acid, Peptide, or Protein
- Immunologic Factor