Electron Microscope Mystery 7

It’s time for another microscope mystery!

The field of view here is about a millimeter. What is it?

mystery7

Update, 4:50p: This is proving to be a tricky one! Here’s a zoomed-out view.

mystery7b

Update, 5:02p: Hooray! @poikiloblastic guessed right, it’s a key.

mystery7c

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