Massed small stromal lymphocytes - coloured

Colour-enhanced, transmission electron micrograph of a mass of small lymphocytes in the conjunctiva of a patient with an autoimmune ulceration of the cornea. The cells have large nuclei and numerous mitochondria. A centriole can be seen towards the centre left of the centre top cell. Collagen fibrils (green) are visible in the stroma between the cells.