“Nobody really wants monkeys walking around with human eggs and human sperm inside them,”

“Because if a monkey with human sperm meets a monkey with human eggs, nobody wants a human embryo inside a monkey’s uterus.”

“I don’t think we’re on the edge of beyond the “Planet of the Apes.” I think rogue scientists are few and far between. But they’re not zero,” Greely said. “So I do think it’s an appropriate time for us to start thinking about, ‘Should we ever let these go beyond a petri dish?'”