derived from bone marrow precursors and are characterized by abundant basophilic cytoplasmic granules that appear electron-dense at the EM level.

• * 光镜胞体较大，呈圆或卵圆形。胞质内充满粗大的嗜碱性分泌颗粒；核小，圆形或卵圆形，着色深，多位于中央。