61.   If the cell lines match the description in the broadly worded Wisconsin patent, these experts say, their owners must obtain approval from the foundation before distributing them.

62.   If existing cell lines are used instead of personalized ones, these scientists and executives said, there are ways to overcome rejection.

63.   Instead of working with a live animal, he said he used a cell line that was already available.

64.   Indeed, many of the institutions currently unable to supply cell lines to researchers are working to rectify the situation.

65.   It is unclear whether the government could compel the owners of those cell lines to share them with other researchers.

66.   Last summer, President Bush authorized federal support of research on the stem cells, but only on already existing cell lines, like those at Wisconsin.

67.   More lines will be needed, Hamberger said, because cell lines may not have always been grown in complete sterility.

68.   No one is sure how many cell lines exist, or how good their quality is.

69.   Only a dozen or fewer cell lines have been described in published reports, and scientists say the quality of the others is unknown.

70.   One plan that is generating considerable discussion is the one to permit research only on existing cell types, or cell lines.