21.   But Dubus takes aim at what counts, what William Faulkner called the things of the human heart.

22.   But its usefulness as a protector of the human heart has not yet been established.

23.   But new findings being provide strong evidence that human heart muscle cells do regenerate after a heart attack.

24.   But new findings provide strong evidence that human heart muscle cells do regenerate after a heart attack.

25.   But no one has ever succeeded in rooting out of the human heart the immense capacity hidden there for hate and death.

26.   But she noted that pig valves are now seen as acceptable replacements in human hearts.

27.   But the sense among experts is that ripping out human hearts and lopping off heads is probably not very good for youngsters.

28.   Cesor Arredondo, a groom in the Lukas stable, had tended to the horse and also tended to the human broken hearts.

29.   Dr. James Thompson at the University of Wisconsin at Madison coaxed embryonic stem cells into human heart cells.

30.   Few things are as enigmatic as the real intentions of the human heart.