Produce

Produce (プロデュース) was an experiment carried out on espers, which occurred in Academy City.

Principles
The experiment was about locating where Personal Reality was in the brain of an esper. It used Child Errors and chopped up their brains with this goal in mind.

Academy City Invasion Arc
During a conversation between Yomikawa Aiho and Accelerator about his past and the Special Ability Institute, Produce is mentioned as one of the research teams that used underhand means to acquire Child Errors for experimentation.

Battle Royale Arc
When Kakine Teitoku brought up Kinuhata Saiai being a former test subject of the Dark May Project, she mentioned that she was super happy compared to the test subjects of Produce who had their brains chopped up like a Christmas cake in order to figure out where in their brains their Personal Realities lay.

Necromancer Arc
Five years prior to current timeline, Hishigata Mikihiko's research team had spent months testing where in the body esper power reside. From limbs to brain parts, they had removed subject's body parts to prove their theory. As the body grew smaller and smaller the output of the power dropped.