Mast cell full of histamine granules (pink) | Immunology for University Students | Scoop.it
From www.cellimagelibrary.org - October 7, 2012 12:23 PM

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 micrometers.