楼主,我给你的图上加了一些箭头,黑色箭头的那些圆,应该不是外泌体;红色箭头的那些,或者形状类似红色箭头指向的可能是外泌体。
你可以参考文献里的图,附件的图2,这个电镜图出处文献:2017 Exosomes purified from a single cell type have diverse morphology
电镜图文献中的描述:(A) Exosomes visualised after negative staining. At least two different categories of vesicle can be identified in this picture: single vesicles (green arrows) and a long tubule (red arrow).