Need Help: What is the structure marked in the pictures of TEM

[yinyundemengxiang]

Hello,everyone,the following images are renal patholodical pictures of transmission electron microscope,but I wonder what the indicated structure marked with red circle.I need your help.Many thanks!

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[yinyundemengxiang]

The images' link are http://min.us/i/HkFuknTnvUr3 and http://min.us/i/bzkW2UiiFbJ0G