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
根中，它还是适
。一些被子植物根中，还发现了第四种组织原，即calpytrogen，
根冠发生有关。
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.
然而根中，它还是适。一些被子植物根中，还发现了第四种组织原，即calpytrogen，根冠发生有关。
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