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Ultimobranchial body/ ultimobranchial gland

lumen with eosinophilic content
columnar epithelium
basophilic coloring due to apical granules
microvilli

Left ultimobranchial body of a laying hen (HE): vesicle with columnar epithelium

The intracytoplasmatic granules are particularly located in the apical cell part. The fuzzy appearance of the apical cell membrane is caused by the presence of short, irregular microvilli and stages of granule discharge.