This is the only immunoglobulin that can normally cross the placenta.

Severe combined immunodeficiencies (SCIDs) are due to:

A positive reaction to the Mantoux tuberculin skin test caused by:

Type III _________, is caused by excess IgG-antigen formations that deposit on cell surfaces and causes inflammation and tissue damage.

Severe combined immunodeficiencies (SCIDs) are due to:

Desensitization therapy to produce IgG blocking antibodies and reduce allergic reactions involves injecting small amounts of

Poison ivy urushiol:

A positive reaction to the Mantoux tuberculin skin test caused by:

Memory cells are created for the first time.  This happens in the:

All are properties of good antigens except: