Basophils are a variety of white blood cell distinguished by the large granules in their cytoplasm that attract basic dyes such as hematoxylin. These granules often obscure the nucleus. There are normally 1.5-5 x 10^7 basophils/L of blood.
For information on granulocyte development, click here.
If you need more information, the best place on the internet to search is usually the National Library of Medicine.
by Robert McLay and John Krause