A Needle So Tiny It Injects Into A Single Cell

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It may be possible to create a needle so small it can inject a vaccine into a single cell. But it's not the product of a medical device company. It's part of something we often think of as making us sick.

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Images:

https://www.gettyimages.com
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https://commons.wikimedia.org/wiki/File:All_secretion_systems.jpg
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