61.   Each laboratory worked with a different kind of human cell.

62.   Entry inhibitors work to prevent the virus from entering the human cell in the first place.

63.   Everyone assumed that human cells would be next.

64.   FDA regulators had looked closely at the plan because of concerns that mixing baboon and human cells could introduce new diseases into the human population.

65.   Factors in the cow egg are thought to make the human cell nucleus revert to its embryonic form.

66.   Finally, even if the baboon cells matured, they would have to recognize human cells that are infected with microorganisms.

67.   Genzyme lobbyists also won approval for a product called Carticel, which requires the cloning of human cells to grow cartilage that can be implanted in knee operations.

68.   Genes are carried on strands of human DNA within chromosomes, threads in the center of human cells.

69.   Gaining entry into the nucleus of human cells is a technically difficult trick that certain viruses have acquired over the course of evolution.

70.   Geron-sponsored scientists said they figured out how to prolong the life of human cells.