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Folic acid molecule. Computer model showing the structure of a molecule of folic acid (vitamin B9). Atoms are colour-coded: carbon (grey), nitrogen (purple) and oxygen (red). Folic acid is required for foetal development in pregnancy. It also ensures normal red blood cell formation and helps to maintain a healthy central nervous system. Deficiency can lead to the development of forms of anaemia and leukaemia. (KEYSTONE/SCIENCE PHOTO LIBRARY/RAMON ANDRADE 3DCIENCIA)