Mast cells densely lied in circumambience of lymphoid nodule and sparsely in central zone, but diffusely distributed in medulla.
在淋巴结内肥大细胞密集于淋巴小结的周围区，在中央区则少见，但在髓质内可见有弥散性分布。
Vicia sativa root nodule is usually rod-shaped, it is mainly composed of many cortex cells and a very large central zone which contains meristem, infected tissue and senescent tissue.
箭舌豌豆根瘤为杆形，主要由皮层细胞和一个体积很大，含有分生组织、侵染组织，有时还有衰老组织的中心区域所组成。
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