Hemoglobin A2

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** A tetrameric complex of 2 molecules of hemoglobin subunit alpha (encoded by either the HBA1 or HBA2 gene) and 2 molecules of hemoglobin subunit delta (encoded by the HBD gene).

**Synonyms:** - Hb A2 - Hb a2d2 - Hemoglobin Alpha2Delta2 - Hgb A2