31.   On a purely scientific level, competition to find a human blood substitute is intense.

32.   One of the most common human blood disorders, sickle-cell anemia is especially prevalent among African-Americans.

33.   Only human blood, they told Spanish priests, could give the sun strength for its daily climb from the underworld.

34.   Oxygen was formed in the explosions of the first generation of stars, and all the iron in human blood came later from supernovas.

35.   Reporters and others were kept away from the site, which has been declared a biohazard because of the threat of disease from the abundance of human blood.

36.   Rhesus monkeys experimentally transfused with human blood made the antibody this time, thus the Rh.

37.   Rausch said the herd is more carefully protected and monitored than is possible with the human blood supply.

38.   Several American scientists then experimented with ways to do the same with human blood.

39.   T-cells are a component of human blood that are key to fighting infection.

40.   The areas around the beds in all three bedrooms tested positive for human blood, they said.