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Across
2.the process causes clumping of the foreign cells
4."police" the body in blood and lymph
6.actually consists of two semi-independent parts
11.a lymphatic mass found low in the throat overlying the heart
12.pick up excess tissue fluid, called lymph
14.occurs when antibodies bind to specific sites on bacterial exotoxins
15.small masses of lymphatic tissue that ring the pharynx
16.any substance capable of exiting our immune
17.help protect the body by removing foreign material such as bacteria and tumor cells
Down
1.the body's second line of defense
3.constitute the gamma globulin part of blood proteins
5.diffuse to nearby cells and bind to their membrane receptors
7.provides protection that is carefully targeted against specific antigens
8.engulfs a foreign particle
9.found in the wall of the small intestine
10.refers to a group of at least 20 plasma proteins that circulate in the blood in an inactive state
13.a blood-rich organ that filters blood

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