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I am protecting the White house and a intruder dressed in black is trying to break into the White house.
My first line of defense is the gate(mechanical).
If the intruder(antigen) gets through the gate, he will be sprayed with pepper spray(chemical) by security.
If the intruder gets by the first line of defense he will be stopped by the second line of defense... The locked door(phagocytes).
When the intruder gets to the locked door he will be shocked(phagocytes) when he touches the knob to break in.
If the intruder(antigen) gets through both lines of defense, the police(antibody) will take charge and kill the enemy.
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