Multiple Colobomata of the Iris (or Polycoria Congenitalis), is a pathological condition of the eye characterized by more than one pupillary opening in the iris. It may be congenital or result from a disease affecting the iris.
Mast cell, coloured transmission electron micrograph (TEM). Mast cells (mastocytes) are a type of white blood cell (leukocyte) found in connective tissue. The large oval (brown) is the cell’s nucleus, which contains its genetic information. Within the cell’s cytoplasm (pink) are granules (red) containing chemical mediators, including histamine and heparin. When the mast cell is activated, either by an allergic reaction or in response to injury or inflammation, these granules are released into the tissues. Histamine is responsible for the symptoms of an allergic reaction, such as itching, and heparin prevents blood from clotting.
Deformed sperm cell, coloured scanning electron micrograph (SEM). This cell has residual cytoplasm (lump, pink) below its head (red, top right).
