1.   But Dr. Inder Verma, a gene therapy researcher at the Salk Institute in San Diego, said scientists set off the frenzy with their own hyperbole.

2.   But many gene therapy researchers had not waited for such advances, experts said.

3.   Gene therapy researchers said they are disheartened but not discouraged.

4.   He is troubled that other gene therapy researchers appear to be backing away from Wilson.

5.   Instead, gene therapy researchers use viruses to carry in copies of entire normal genes in an effort to replace defective genes.

6.   Many university-based gene therapy researchers have company ties.