"I'm sure you've heard about the mythical creature known as the griffin, right?" says the assistant, showing you a large illistration on the wall.
"Sure I have." you reply "But it doesn't really exist of course."
"Ah, but we intend to change that" replies the assistant "We found a way to mix eagle and lion DNA and hope to create one."
You get a bit worried about this. It sounds a bit like Frankenstein and playing God. "You mean you're planning to inject an eagle egg with lion DNA?"
"Oh, no." she replies "The eagle genes will be too dominant. We're going to inject a human with both sets of genes and transform them."
You're shocked by this "That's crazy! Where will you find a poor guinea pig willing to participate in this mad sceme?"