Eosinophil
Eosinophils are a type of white blood cell. They fall under granulocytes, which are a category of white blood cells, along with neutrophils and basophils. They are heavily involved in the immunological response to parasites and some eukaryotic infections. They also play a significant role, along with mast cells, in the regulation of allergies and asthma Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title.
Eosinophils come to existance by a process called haematopoiesis, which takes place within the bone marrow. However when fully mature they reside within the bloodstream Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title. Once within the blood they are mainly found in the medulla, uterus, spleen and lymph nodes. If they are found in other internal organs, in a healthy individual, then this indicates disease.