She's right, and he's no biologist. Once again he laments the fact that Bruce is gone, but that was his choice. Tony shakes his head, placing his hand over hers without moving his gaze from her face.

"There might be. I'll reach out to some... people in the know." He means in the mutant community, but whatever. Same dif. "It's gonna be fine." As always, his optimism wins out against any battling negativity, especially where Pepper is concerned.