Duodenum, mucosa - Strong chromogranin A immunostaining of neuroendocrine cells. Due to the high level of chromogranin A protein in these cells, adjacent non-neuroendocrine cells show "contamination artifacts".
Ectocervix
Endocervix
Endocervix - Few neuroendocrine cells are chromogranin A positive.
Endometrium, proliferation
Endometrium, secretion
Epididymis
Esophagus, squamous epithelium
Fallopian tube, mucosa
Fat
Gallbladder, epithelium
Heart
Ileum, mucosa
Kidney, cortex
Kidney, medulla
Liver
Lung
Lymph node
Ovary, stroma
Pancreas - Strong chromogranin A positivity in islets of Langerhans.
Parathyroid gland - Strong chromogranin A staining of epithelial cells.
Parotid gland
Pituitary gland, anterior lobe - Strong chromogranin A staining of epithelial cells.
Pituitary gland, posterior lobe
Pregnant uterus (decidua)
Placenta, early
Placenta, mature
Placenta (amnion and chorion)
Prostate
Seminal vesicle
Sinus paranasales
Skin - Few neuroendokrine (Merkel-) cells show chromogranin A immunostaining.
Spleen
Stomach, antrum
Stomach, corpus
Stomach, corpus - Expression of chromogranin A is so strong in neuroendocrine cells of the stomach, that diffusion of the staining product towards adjacent cells can occur.