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reach adult levels (less than 1% of total hemoglobin) usually within the first year, as adult forms of hemoglobin begin to be produced. Diseases such as beta thalassemias, which affect components of the adult hemoglobin, can delay this process, and cause hemoglobin F levels to be higher than normal. In sickle cell anemia, increasing the production of hemoglobin F has been used as a treatment to relieve some of the symptoms.

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