Can adult humans be induced to produce fetal hemoglobin?
Fetal hemoglobin, or foetal haemoglobin,  is the main oxygen transport protein in the human fetus during the last seven months of development in the uterus and in the newborn until roughly 6 months old. Functionally, fetal hemoglobin differs most from adult hemoglobin in that it is able to bind oxygen with greater affinity than the adult form, giving the developing fetus better access to oxygen from the mother's bloodstream.
Unusually high levels of fetal haemoglobin production can ameliorate sickle cell disease and β thalassaemia. Although efforts directed at the pharmacological stimulation of fetal haemoglobin as an approach to managing these conditions have met with limited success, there is wide variation in individual responses. 
Based on results, adults humans could be induced to produce fetal hemoglobin.