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I love those virus shapes. They always fascinated my as a kid in science class.
and what little dances are are they doing with those little legs??
It's crazy how cute a lot of these things look under a microscope. Even E coli. looks adorable wriggling around.
The "legs" grab onto bacterial cell membranes to insert the central stalk like a syringe. It is a specialised adaptation to parisitism of a specific kind of host, which is observed in many advanced obligate parasites. This kind of specialisation results from many generations of co-evolution.
FAKE NEWS! This us a bacteriophage! It infects bacteria, not humans!