The body enhancement facility
The body enhancement facility was a section aboard Ru'afo's flagship which was used to genetically enhance the Son'a by removing toxins from their body and tightening their skin. Tarlac and Ellora nurses operated the machines and performed the enhancement. (Star Trek: Insurrection)
The set was originally used as the Museum of Kyrian Heritage in the Star Trek: Voyager fourth season episode "Living Witness", built on Paramount Stage 16. A few modifications including new walls, set decoration and painting were done. (Delta Quadrant, p. 239; The Secrets of Star Trek: Insurrection, p. 117)