膜蛋白是不对称的 [mmunoglobulin-like domains Lectin domain C-terminus Ligand-binding Adhesive region domain (binds carbohyarates) Cytosol Retinal bilayer Outside c83 Plasma membrane Exterior N-terminus Inside Integrin Cadherin N-CAM Selectins膜蛋白是不对称的 配体结合域 黏附域 类免疫球蛋 白域