represent one of the three types of granulocytes, which are neutral white blood cells
. This type is rare (less than 1% of all granulocytes), and play a role in the immune system by neutralizing inflammation, allergies
, and infection
. They achieve this by means of the chemical molecules they contain, histamine and heparin
, which impair blood vessel coagulation
. The first also activates an inflammatory reaction, drawing other white blood cells to the site that are designed to fight infection.