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The initial encounter with an allergen is called the ________.

A person who is Rh– will have anti-Rh antibodies in their serum from early infancy.

________ is the most abundant class of antibodies in serum.

The human microbiome is considered an important component of the first line of defense.  Which statement adequately reflects its role as a defensive barrier?

The tuberculin skin test is read ________.

The human microbiome is considered an important component of the first line of defense.  Which statement adequately reflects its role as a defensive barrier?

Class I MHC genes code for ________.

Activation of B cells occurs when antigen binds to B-cell surface immunoglobulin receptors.

The immunoglobulin class that has an Fc region that binds to receptors on basophils and mast cells is ________.

Which of the following is not a chief function of inflammation?