Rc cells

Rc cells are certain cells that exist only in the story of Tokyo Ghoul. They exist in both humans and ghouls. They flow like blood but can become as solid as teeth, and could be called "liquid muscles". Typically, a ghoul stocks Rc cells by eating people. Within the body, the Rc cells are concentrated and stored in a kakuhou. The kagune is formed by Rc cells that have been released from a kakuhou and have pierced through the skin.

Rc cells are the nutrients ghouls need to ingest.

The characteristics of the Rc cells differ depending on the Rc type of the ghoul.

Rc factor and level
The Rc factor is a measure for the amount of Rc cells in the body of a living being. Ghouls have an "Rc factor" ten times higher than humans. The average healthy human has an Rc factor of about 200-500, while a ghoul has an Rc factor of about 1000-8000.