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(6) What do these white blood cells have?

(7) What are antigens?

(8) Certain kinds of white blood cells produce what?

(9) What are antibodies?

(10) Antibodies latch onto what?

(11) What do the antibodies do?

(12) What are the white blood cells called that stay around in the blood after the original infection has been fought off?

(13) What do memory cells do?

(14) What is this known as?