51.   A major problem she had to solve was providing an adequate blood supply.

52.   A large clot or chunk of plaque can cut off the blood supply to a significant portion of the brain, producing a stroke.

53.   A safe blood supply is essential to containing the crisis, and for the people who run the blood banks that responsibility can mean hard decisions and hurt feelings.

54.   A mystery virus is contaminating blood supplies throughout the world.

55.   Adams uses standard instruments to detach one end of a healthy artery beneath the ribs and stitch it to a blocked heart artery to restore the blood supply.

56.   But because dead tissue has no blood supply, the organism cannot be reached by antibiotics.

57.   But endostatin forces large aggressive tumors in experimental mice to shrink back down to a microscopic size at which they have no need for a private blood supply.

58.   But now, more patients and doctors are interested in bloodless surgery as a way to avoid tainted and dwindling blood supplies.

59.   But the new test has been approved just as two more costly techniques for cleaning up the blood supply are being developed.

60.   But uterine embolization, which shrinks fibroids by blocking their blood supply, would not only preserve her uterus, but her recovery would be much quicker.