White blood cells attacking a parasite. It's happening in a petri dish, but similar stuff is happening in our bodies all the time. A human body is basically a complex ecosystem – and we've all got tiny armies inside us. https://t.co/4TOE7rjnKE pic.twitter.com/rZsFWOhVsn
— Steve Stewart-Williams (@SteveStuWill) May 16, 2020
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