User blog comment:Jurassic Park Treasury/Great news about resurrecting extinct animals/@comment-1259419-20140529104328

You see that Church is actually using the method of Henry Wu. He takes an extant genome, only changes the parts that matter and clone it. I know, in the film they make it seem like he only filled gaps in the Dino-DNA. But in the novels he only focussed on the parts of Dino DNA that mattered, to save time en energy.

Even in real-life Wu's method is prefered over Laura Sorkin's approach. In which these "short-cuts" weren't allowed.