In roots, however, the concept is still applied, and in some angiosperm roots a fourth histogen zone is recognized, the calpytrogen, which gives rise to the root cap.
然而
，它还是适用的。一些被子植物的，还发现了第四种组织原，即calpytrogen，
冠发生有关。
In roots, however, the concept is still applied, and in some angiosperm roots a fourth histogen zone is recognized, the calpytrogen, which gives rise to the root cap.
然而，它还是适用的。一些被子植物的，还发现了第四种组织原，即calpytrogen，冠发生有关。
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