Which of the following kinds of proteins circulates in the blood and coats the surfaces of microbes to make them more susceptible to engulfment by phagocytic cells?

Question

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Defensive proteins, such as complement proteins and antibodies, circulate in the blood and can coat the surfaces of microbes to make them more susceptible to engulfment by phagocytic cells. Histamine is not a protein that circulates in the blood and does not coat microbes. B cell receptors and antigens are not proteins that can coat microbes.

Which of the Following Kinds of Proteins Circulates in the Blood