Fig. 1.

Small intestine biopsy samples show rare enteroendocrine cell staining. Endoscopic biopsy samples were obtained at 5 months of age. Immunohistochemical analysis was carried out on paraffin-embedded intestinal biopsies. A, Hematoxylin and eosin stain shows small intestinal mucosa with villous atrophy and mild crypt hyperplasia. B, Periodic acid-Schiff stain shows goblet cells. C, Lysozyme stain shows Paneth cells. D, Normal control with chromogranin A stain shows neuroendocrine cells (NE) within the glands. E, Chromogranin A stain shows complete absence of neuroendocrine cells within the glands.