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The classical complement cascade can only be activated after antibodies bind to a pathogen.

Mature T and B cells can travel through

An organism that can cause disease when the host immune defenses are weak or when it establishes somewhere in the body it is not commonly found is called:

Whenever antibodies are involved, which complement pathway is the last to be activated?

Edward Jenner created the first vaccine against a disease. He used the cowpox virus to create a vaccine that would provide protection against the smallpox virus.

Which of the following is true about initial protease activity in the complement pathways?

Once a pathogen gets into a body, the innate immune system kicks in, causing which of the following?

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 ___________.