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. 2021 Jan 27;20:22. doi: 10.1186/s12943-021-01312-y

Fig. 2.

Fig. 2

Typical structure, biological properties and functions of exosomes. Exosomes (size range ~40 to 160 nm) are extracellular vesicles generated by all cells. Exosomes can contain different types of cell surface proteins, intracellular protein, RNA, DNA, amino acids, and metabolites. Exosome surface proteins include tetraspanins, integrins, immunomodulatory proteins, and more. Several molecules are used as exosome markers (CD9, CD81, CD63, TSG101, ceramide, and Alix). Exosomes can be a highly heterogeneous population with pleiotropic functions. They are mediators of near and long-distance intercellular communication in health and disease and affect various aspects of cell biology.