51.   EPO, which boosts endurance through production of red blood cells to carry oxygen, is being tested for at the Olympics for the first time.

52.   EPO stimulates the production of red blood cells which carry oxygen to the muscles.

53.   Eliminating the need to carry oxygen could cut the weight of a space-faring version of such a plane in half.

54.   EPO, or erythropoetin, boosts stamina by stimulating the production of red blood cells which carry oxygen to the muscles.

55.   Hardly resting after becoming the first woman to climb Mount Everest alone and without carrying oxygen, Alison Hargreaves took on a Himalayan peak feared as a killer.

56.   Hemoglobin, the red blood cells, carries oxygen from the lungs to the body tissues, and carbon dioxide from the tissues to the lungs.

57.   Hemoglobin, the primary constituent of red blood cells, carries oxygen from the lungs to the body tissues, and carbon dioxide from the tissues to the lungs.

58.   However, she tested positive for darbepoetin, which boosts production of red blood cells that carry oxygen to muscles.

59.   It boosts the production of red blood cells that carry oxygen to muscles, and it can push top cross country skiers to go even faster.

60.   Muehlegg tested positive for darbepoetin, a substance used to treat anemia by boosting the production of red blood cells that carry oxygen to muscles.