Colorized transmission electron microscope image of a mast cell full of histamine granules (pink). Histamine is released as part of an allergic reaction. The diameter of the cell is approx. 8.4 microm...

Confocal micrograph of a stimulated mast cell that has just exploded releasing numerous histamine granules. The remains of the cell are seen towards the lower left, still containing a number of granul...

Confocal micrograph of a mast cell in human eye with conjunctivitis. This image shows a single mast cell invading conjunctival tissue in response to an inflammatory agent or pathogen. The mast cell c...