Hemoglobin A2: Information from Answers.com

Hemoglobin A2 is a normal variant of hemoglobin A that consists of two alpha and two delta chains and is found in small quantity in normal human blood. Hemoglobin A2 may be increased in beta thalassemia.

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MeSH Hemoglobin+A2

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Proteins: hemeproteins

Globins

Hemoglobin

Subunits	Alpha locus on 16: α (HBA1, HBA2) · ζ (HBZ) · θ (HBQ1) · μ (HBM) Beta locus on 11: β (HBB) · δ (HBD) · γ (HBG1, HBG2) · ε (HBE1)

Tetramers	stages of development: HbA (α₂β₂) · HbA2 (α₂δ₂) · HbF/Fetal (α₂γ₂) · HbE Gower 1 (ζ₂ε₂) · HbE Gower 2 (α₂ε₂) pathology: HbH (β₄) · HbS (α₂β^S₂) · HbC (α₂β^C₂)

Compounds	Carboxyhemoglobin · Carbaminohemoglobin · Oxyhemoglobin/Deoxyhemoglobin · Sulfhemoglobin

Other human	Glycosylated hemoglobin · Methemoglobin

Nonhuman	Chlorocruorin · Erythrocruorin

Other

human: Myoglobin (Metmyoglobin) · Neuroglobin · Cytoglobin
plant: Leghemoglobin

Other

Cytochrome (Cytochrome b, Cytochrome P450) · Hemocyanin · Methemalbumin

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