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What is the initial protease in the Classical pathway?

Antibody functions include:

Many of the complement components are made by the _______ cells, and can be found in ___________.

Mature lymphocytes encounter pathogens in:

The adaptive immune response of the immune system is known to be fixed but specific, while the innate immune response is said to be flexible.

The binding of C3b by CR1 on macrophages leads to:

C3a can recruit phagocytes from the blood to the site of infection.

Which lymphocyte has dark staining granules and is involved in allergic responses.

Which of the following is able to bind antigens?

The innate immune response of the immune system is _____, while the adaptive immune response is ______.