31.   A synthetic form of the hormone is used now.

32.   A synthetic form of EPO is considered the drug of choice in endurance sports, particularly cycling.

33.   A synthetic form of the drug is used therapeutically, especially to treat slow growth in children.

34.   Another key issue is the need to find reliable tests for EPO, human growth hormone and other synthetic forms of naturally occurring substances.

35.   Both substances occur naturally in humans but athletes can improve their performances by taking more in synthetic form.

36.   But it can also indicate the use of a synthetic form of the hormone EPO.

37.   EPO occurs naturally in humans but some endurance athletes injected synthetic forms to enhance their performance as it increases the ability of the bloodstream to carry oxygen.

38.   EPO occurs naturally in the body but can be taken in synthetic form to boost oxygen in red blood cells.

39.   If the blend is absent, the test concludes the subject injected the synthetic form.

40.   Last December, the FDA approved Muse, a suppository version of the same drug, a synthetic form of the hormone prostaglandin E that is generically called alprostadil.