HbA: a2B2/HbF: a2Y2 Globular tetramer MW645KD a-Chain 16pl33 Polypeptide length of 141 amino acids 阝 Chain 11p15.4 Polypeptide length of 146 amino acidsHbA: α2β2 / HbF: α2 γ2 • Globular tetramer • MW 64.5 kD • α-Chain – 16p13.3 – Polypeptide length of 141 amino acids • β-Chain – 11p15.4 – Polypeptide length of 146 amino acids