3）环带亚单位，位于柱状亚单位之内，由8个颗粒结构围绕核孔形 成一个通道。 中央栓（central plug）：transporter位于核孔中心，呈棒状或颗粒状， 一般认为，它对核质交换中起作用。
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镜下见，肝外胆道闭锁导致肝脏大量黄绿色胆栓、假胆管增生(见于下面的中央)、广泛纤维化。
Microscopically, extrahepatic biliary atresia leads to this appearance in the liver, with numerous brown-green bile plugs, bile duct proliferation (seen at lower center), and extensive fibrosis.
结论大剂量尿激酶冲击溶栓治疗视网膜中央动脉阻塞完全有效，其治疗效果大大好于传统治疗方法。
Conclusion Thrombolytic therapy of high dose urokinase impact for central retinal artery occlusion is safe and effective, and the result is better than traditional therapy.
目的观察超选择性动脉插管溶栓治疗视网膜中央动脉阻塞(CRAO)的治疗效果。
Objective To evaluate the therapeutic effects of super-selective arterial catheterization with thrombolysis for central retinal artery occlusion (CRAO).
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