An example of artificial active immunity would be ________.

T cells have a MHC class II receptor but lack MHC class I receptors.

Over 300 CD cell surface identification markers have been discovered.

A secondary acquired immunodeficiency is ________.

Food allergies include gastrointestinal symptoms and often hives.

All antigens are immunogens.

Each of the following is an autoimmune disease except ________.

The lymphoid tissues of the intestinal tract are collectively referred to as ________.

The benefit of specific immunity is the production of ________ that provide long-lasting protection.

The body region where a ciliary escalator helps to sweep microbes trapped in mucus away from that body site is the ________.