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Huh?! This "skin" thingy won't let me get into the bloodstream!
But this cut will!
Oh, hi there! I'm a white blood cell. My job is to patrol the bloodstream to find intruders. As long as we have the antibodies that match the germ's antigen, we send them out to clasp on to germs!
I'm a white blood cell, too! But my job is different; I help kill germs that have antibodies on them.
Alert! Intruder! Alert! Alert! Send antibodies to the battlefield!
Did someone say antibody? That's me! When the white blood cells detect an intruder that they have the cure for, they create antibodies like me! I bind to an antigen found only on the intruder. Some of us can neutralize germs all by ourselves! Now, get him!
(Gasp!) Antibodies; a red flag! This must be a germ! Time for me to fight him!
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