. "The process in which the identity of an organ is maintained. Identity is considered to be the aggregate of characteristics by which a structure is recognized." . . . "maintenance of organ identity" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .