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    "Immune response-associated" proteins, found on B cells and antigen-presenting cells of mice; an old term now replaced with MHC (major histocompatibility complex) class II molecules.


Literally, the ability of tissues to get along; in immunology, it means identity in all transplantation antigens. These antigens, in turn, are collectively referred to as histocompatibility antigens.



An abnormal physical or psychological state in a male characterized by inability to copulate because of failure to have or maintain an erection.

Impaired digestion, especially after eating.

The diminished or absent ability to conceive or produce an offspring while sterility is the complete inability to conceive or produce an offspring.

An acute viral infection involving the respiratory tract. It is marked by inflammation of the nasal mucosa, the pharynx, and conjunctiva, and by headache and severe, often generalized, myalgia.

Disorders characterized by impairment of the ability to initiate or maintain sleep. This may occur as a primary disorder or in association with another medical or psychiatric condition.


The combined antigenic determinants (idiotopes) found on antibodies of an individual that are directed at a particular antigen; such antigenic determinants are found only in the variable region.

Immediate-type hypersensitivity
Hypersensitivity tissue reaction occurring within minutes after the interaction of antigen and antibody.

Immune adherence
The adherence of particulate antigen coated with C3b to tissue having cells with C3b receptors.

Immune complex
Antigen bound to antibody.

Immune modulators
Substances that control the expression of the immune response.

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