Sebaceous cells are blob-like cages made out of grease that encapsulate the bodies of their victims, leaving only their heads and hands open to the world.
Due to the lack of prisons on Calydon, convicts are lined up next to each other in sebaceous cells. The sebaceous cells provide prisoners with energy and absorb all their dead cells, secretions, and excretions. Hormones in the grease ensure the prisoners' muscles don't atrophy, but the inevitable hysteria from being trapped in grease is still a kink the developers are considering working out.
Sebaceous cells are produced using a tailor-made F. crassus that makes a grease-like biofilm.
Credit to Govind Shah for "Grease Cells."