this post was submitted on 14 Jan 2025
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The colors are added in, of course, with it being an electron microscope image. Another picture:

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[–] Insolentjellyfish@lemmy.world 20 points 8 hours ago

At very rough estimate, I would guess a 30 gauge needle. They have an outer diameter of .31 mm. A blood cell is about 7 micrometer across. It looks like you can fit more a smidge fewer than 50 cells across the thickest part of this needle. Cheers!