Basophilic granulocyte (peripheral blood, human)

Electron microscopy. The detail shows close to the nucleus characteristic developing basophilic granules (specific granules) (8-13 μm). At thin arrow (↓) a small Golgi area with a small specific granule. At (***) granules with different osmiophilic internal structures. The basophilic granules vary in size and shape and are more regular granular-filamentous, in contrast to the myelin figure-like (scrolls-like) inclusions in the mast cell. All the granules contain among others, heparin, histamine, sulphated proteoglycans, leucotriene 3, etc.