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loose central part of a plant's stem or a few roots consisting of thin-walled
tissues
and sometimes contains thick-walled tissue. Myelin cells are generally larger, with cell gaps, cells often store starch, pigment, chanel, etc., but also oil and rubber pipes, and some stone cells (such as camphor). Some plant stems mature earlier, while others continue to stretch, causing the myelin to rupture, forming cavities such as the hollow stems of the undergraduate, umbrella, gourd, etc. This destruction is often confined to the festival, which retains its essence. Some plants can also be seen during the festival with a series of flaky myelin tissues (e.g. walnut genus, maple genus).