Allergen Smooth muscle cell CD4 rm Small blood vessel L-4 B cell TH cell Mucous gland Allergen Fc receptor Vasoactive for IgE amines Blood platelets Allergen y Sensory-nerve Plasma cell Memory cell Degranulation endings Allergen- Sensitized mast cell specific IgE Eosinophil I型超敏反应的基本过程 I型超敏反应的基本过程