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The antibody-containing portion of blood fluid is known as ____.​ ​macrophage

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The answer is the blood plasma.
Antibodies are specialized proteins that travel through the blood stream and are found in bodily fluids. They are used by the immune system to identify and defend against foreign intruders to the body. Blood plasma contains proteins, salts and minerals, it serves a variety of functions including maintaining a satisfactory blood pressure and volume to supplying critical proteins for blood clotting and immunity.
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