"The Cornell scientists put a gene for a fluorescent protein into the single-celled human embryo. The embryo had three sets of chromosomes instead of two."
After the embryo divided for three days, all the cells in the embryo glowed, Rosenwaks said. He said the goal of the work was to see if the fluorescent marker would carry into the daughter cells, allowing genetic changes to be traced as cells divided."
"A spokesman for the National Institutes of Health said the Cornell work would not be classified as gene therapy in need of federal review, because a test-tube embryo is not considered a person under the regulations."