((exclusive)) | Sembulingam Physiology 9th Edition Pdf

| Type of Hemoglobin | Symbol | Polypeptide Chains | Occurrence | | :--- | :---: | :--- | :--- | | Adult Hemoglobin | HbA | 2α, 2β | Major hemoglobin in adults (95-98%) | | Hemoglobin A2 | HbA2 | 2α, 2δ | Minor hemoglobin in adults (2-3%) | | Fetal Hemoglobin | HbF | 2α, 2γ | Major hemoglobin in fetus | | Embryonic Hemoglobin | HbE | varies | Present in early embryonic life |

Hemoglobin is a conjugated protein consisting of two parts: sembulingam physiology 9th edition pdf