Ummmm, wouldn't that be Engineered Human?
Does anyone ever want to play a PSH? To be honest, I can see why they left that option out of the rules -- PSHs are boring and miss out on the fun of Gamma World. Sure you can build an option for them that is balanced, stat-wise, but that doesn't make them fun.
Oops, looks like this request tried to create an infinite loop. We do not allow such things here. We are a professional website!