The tubulo - vesicular elements were observed in both the young and old OBs.
英
美
(3)在年轻及年老的OBs中都可以观察到管泡状成分; (4)在年轻及年老OBs中,均发现与Golgi复合体及平滑内质网(SER)有关的胞浆内小体;
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