Hemoglobin J

**Definition:** A group of abnormal hemoglobins with similar electrophoretic characteristics. They have faster electrophoretic mobility and different amino acid substitutions in either the alpha or beta chains than normal adult hemoglobin. Some of the variants produce hematologic abnormalities, others result in no clinical disorders.

**Tree numbers:** - D12.776.124.400.463.480 - D12.776.422.316.762.426.480