Shows hemoglobin and red blood cells inside capillaries. Next, a busy street in Africa is seen. Men wear various hats and turbans. A man carries a crate, while women holds an umbrella. A dot matrix printer then prints text onto line paper and, a red pen circles a word. Animation for a DNA mutation and gene inheritance are displayed. Sickle sells are seen clogging capillaries at the end. Magnified chromosomes. Shot of magnified capillaries. Shot of magnified sickle blood cell and regular blood cells. Blood cells moving through and blocking capillaries.