这个词是什么意思？
Membrane limited structures derived from cell membranes and cytoplasmic material, and released into EXTRACELLULAR SPACE. They circulate through the EXTRACELLULAR FLUID and through the peripheral blood in the MICROVASCULATURE where cells, much larger, cannot, thereby affecting a variety of intercellular communication processes.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000067128 · MeSH 2026。
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