Adrenal gland
Adrenal gland 
Aorta, media
Aorta, media 
Appendix, mucosa – All epithelial cells are KRT18 positive.
Appendix, mucosa - All epithelial cells are KRT18 positive.
Appendix, muscular wall
Appendix, muscular wall 
Bone marrow
Bone marrow 
Breast – Luminal cells but not myoepithelial cells stain CK18 positive in normal breast.
Breast - Luminal cells but not myoepithelial cells stain CK18 positive in normal breast.
Bronchus, mucosa
Bronchus, mucosa 
Cerebellum (molecular layer, Purkinje cell layer, granule cell layer, white matter)
Cerebellum (molecular layer, Purkinje cell layer, granule cell layer, white matter)
Cerebellum (white matter)
Cerebellum (white matter)
Cerebrum, grey matter
Cerebrum, grey matter
Cerebrum, white matter
Cerebrum, white matter
Colon descendens, mucosa – All epithelial cells are KRT18 positive.
Colon descendens, mucosa - All epithelial cells are KRT18 positive.
Colon descendens, muscular wall
Colon descendens, muscular wall 
Duodenum, Brunner gland – Weak KRT18 staining of Brunner glands.
Duodenum, Brunner gland - Weak KRT18 staining of Brunner glands.
Duodenum, mucosa
Duodenum, mucosa 
Ektocervix
Ektocervix
Endocervix – Strong KRT18 staining of all epithelial cells.
Endocervix - Strong KRT18 staining of all epithelial cells.
Endometrium, proliferation
Endometrium, proliferation 
Endometrium, secretion
Endometrium, secretion 
Epididymis – All epithelial cells are KRT18 positive.
Epididymis - All epithelial cells are KRT18 positive.
Esophagus, squamous epithelium
Esophagus, squamous epithelium 
Fallopian tube, mucosa
Fallopian tube, mucosa 
Fat
Fat
Gallbladder, epithelium
Gallbladder, epithelium 
Heart
Heart
Ileum, mucosa – All epithelial cells are KRT18 positive.
Ileum, mucosa - All epithelial cells are KRT18 positive.
Kidney, cortex
Kidney, cortex 
Kidney, medulla
Kidney, medulla 
Kidney, pelvis, urothelium – The urothelium shows the strongest KRT18 staining in umbrella cells. Staining intensity decreases gradually from the top to the bottom layers of the urothelium.
Kidney, pelvis, urothelium - The urothelium shows the strongest KRT18 staining in umbrella cells. Staining intensity decreases gradually from the top to the bottom layers of the urothelium.
Liver – Liver tissue shows a zonal variability of KRT18 expression in hepatocytes ranging from weak to strongly positive while bile ducts are always strongly positive.
Liver - Liver tissue shows a zonal variability of KRT18 expression in hepatocytes ranging from weak to strongly positive while bile ducts are always strongly positive.
Liver – Not all hepatocytes stain positive for CK18 (zonal distribution).
Liver - Not all hepatocytes stain positive for CK18 (zonal distribution).
Lung
Lung
Lymph node – A delicate KRT18 staining occurs in fibroblastic reticulum cells of lymphoid organs.
Lymph node - A delicate KRT18 staining occurs in fibroblastic reticulum cells of lymphoid organs.
Ovary, stroma
Ovary, stroma 
Pancreas
Pancreas
Parathyroid
Parathyroid
Parotid gland
Parotid gland 
Pituitary, anterior lobe
Pituitary gland, anterior lobe 
Pituitary gland, posterior lobe
Pituitary gland, posterior lobe
Pregnant uterus (decidua)
Pregnant uterus (decidua) 
Placenta, early
Placenta, early 
Placenta, mature
Placenta, mature 
Placenta (amnion and chorion) – Strong CK18 staining in chorion cells while the amnion cells are only weakly CK18 positive.
Placenta (amnion and chorion) - Strong CK18 staining in chorion cells while the amnion cells are only weakly CK18 positive.
Prostate
Prostate
Rectum, mucosa
Rectum, mucosa 
Seminal vesicle
Seminal vesicle 
Sinus paranasales
Sinus paranasales 
Skin
Skin
Spleen
Spleen
Stomach, antrum – Strong KRT18 staining of all epithelial cells.
Stomach, antrum - Strong KRT18 staining of all epithelial cells.
Stomach, corpus
Stomach, corpus 
Striated muscle
Striated muscle 
Testis
Testis
Thymus – Some elements (few cells) of Hassal bodies are CK18 positive.
Thymus - Some elements (few cells) of Hassal bodies are CK18 positive.
Thymus
Thymus
Thyroid gland
Thyroid gland 
Tonsil, surface epithelium
Tonsil, surface epithelium 
Urinary bladder, muscular wall
Urinary bladder, muscular wall 
Urinary bladder, urothelium – Urothelium with particularly strong staining in umbrella cells. CK18 staining is weaker in urothelial cells and gradually decreases from the top to the bottom layers.
Urinary bladder, urothelium - Urothelium with particularly strong staining in umbrella cells. CK18 staining is weaker in urothelial cells and gradually decreases from the top to the bottom layers.
Uterus, myometrium
Uterus, myometrium