sentence: Basophils carry histamine and heparin, and other protein chemicals.
sentences_before: Basophils are rare granulocytes. If you had 1000 white blood cells, only 1 to 3 of them would be Basophils. Theit nucleus is hidden by granules which turn dark blue in color when stained.
sentences_after: They appear at the sites of ectoparasite infection, or allergies. We don't know exactly how they work.
concept_name: basophil
headings: White blood cell Types of white blood cells Granulocytes Basophils
categories: Cell biology Immunology Blood cells