immunohistochemical scanning of the entire resected specimen of colon from three children with hirschsprung 's disease demonstrated large numbers of d7 immunoreactive nerve fibers in the circular muscle of the ganglionic colon , few fibers in the transitional zone , and no immunoreactive fibers in the aganglionic segment of bowel .
C0019569
hirschsprung 's disease
C0021853
bowel