preform

“The preformed immunity seems a real showstopper,” says David Curiel, a gene therapy researcher at Washington University in St. Louis.

Vitamin A comes in two main forms, preformed vitamin A and provitamin A.

But preformed antibodies also attack other new tissue, including transplanted organs.

“We know all the football history England brings. But what is important is to preform on the pitch,” he said.

Still, it must be exhausting to be Tom Cruise, who famously preforms his own stunts.