With Dr. Hall joining us, we will make important progress in this area.

Dr. Hall said he had not yet tried to derive human stem cells this way.

Dr. Hall, 49, said he earned $110,000 a year in 1985 and now made $85,000.

Dr. Hall died of heart failure, his family said.

Dr. Hall says she expects the number will rise this year.

Dr. Hall said none of the 81 people identified as having contact with him exhibited any symptoms.

Dr. Hall said she would not be able to take up her new post until July 17.

For example, Dr. Hall and others think it is used to control pregnancy development.

"There is still the chance that Dr. Hall may be able to tell us something."

Dr. Hall said she had not felt any hostility in the building.