Sickle cell anaemia is an inherited blood disorder, characterised primarily by chronic anaemia and periodic episodes of pain and occurring in approximately 1 in every 400 African-American infants born in the United States each year. Individuals of Mediterranean, Arabian, Caribbean, South and Central American, and East Indian ancestry can also be affected. The underlying problem involves haemoglobin, a component of the red cells in the blood. The haemoglobin molecules in each red blood cell carry oxygen from the lungs to the body organs and tissues and bring back carbon dioxide to the lungs....