Rc cells

RC cells are certain cells that exist only in the story of Tokyo Ghoul. They exist in both humans and ghouls. They are related to blood by a way or another since a ghoul's Kagune is described as "flow of blood", and so they seems to contain some sort of "muscle liquid".

RC cells also seems to be a primary structure ghouls need to feed on.

RC factor and level
Ghouls have an "RC factor" ten times higher than a human.{ChapterRef|20}}If the average healthy human has about 200-500 RC level, then the ghoul has about 1000-8000 RC level.{ChapterRef|29}}

RC types in ghouls
See also: Kagune

Ghouls' Kagune type depends on RC types that ghouls have, and they are:
 * Ukaku (羽赫, ukaku, approximately stands for twinkling feather)
 * Koukaku (甲赫, kōkaku, approximately stands for twinkling shell)
 * Rinkaku (鱗赫, rinkaku, approximately stands for twinkling scales)
 * Bikaku (尾赫, bikaku, approximately stands for twinkling tail)