Mice affected by β-thalassemia intermedia and major show different levels of anemia. The mice have been divided according to their age and treatment (transplantation, tp; blood transfusion, tx). 2M indicates 2-month-old no transplant; 2MTP, 2 months after transplantation; 5M, 5-month-old no transplant; 5MTP, 5 months after transplantation; 12M, 12-month-old no transplant; 5MTPTX, 5 months after transplantation and blood transfusion; ■, Hb (g/dL); ▩, RBC (× 10⁶/μL); □, reticulocytes (× 10⁵/μL). The inset shows Hb levels of (th3/+)^tptx-5M and (th3/th3)^tptx-5M mice. Error bars represent SD performed on at least 3 animals per group. Sex: female. The age of the animals at transplantation was 8 to 10 weeks.