A speculative medical or biological procedure involving the transplantation of tissues, organs, or genetic material from an
alien lifeform into a human (or vice-versa). It's the ultimate transplant surgery, facing monumental challenges of
bio-incompatibility, novel immune responses, and fundamentally different cellular chemistries. The goal could be to confer
alien adaptations (radiation resistance, toxin processing) to humans, or to repair human injuries with robust
alien tissues. It sits at the terrifying and fascinating intersection of xenobiology and surgery.
Xeno-Grafting Example: In a sci-fi setting, a human settler on a high-radiation world receiving a graft of photosensitive, self-repairing
skin from a native "stone-hide"
creature to protect against solar flares would be Xeno-Grafting. The procedure would require suppressing the human immune system while also preventing the
alien tissue from metabolizing the host's body for its own, incompatible needs.