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Biology

A natural science concerned with the study of life or living matter in all its forms and phenomena, especially in relation to their origin, growth, reproduction, structure, behaviour and evolution.

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Biology > Immunology

passive cutaneous anaphylaxis (PCA)

Biology; Immunology

The passive transfer of anaphylactic sensitivity by intradermal injection of serum from a sensitive donor.

passive hemagglutination

Biology; Immunology

Technique for measuring antibody, in which antigen-coated red blood cells are agglutinated by adding antibody specific for the antigen.

passive immunization

Biology; Immunology

Immunization of an individual by the transfer of antibody synthesized in another individual.

pathogen

Biology; Immunology

An agent which causes disease.

perforin

Biology; Immunology

A molecule synthesized by cytotoxic T cells and NK cells that polymerizes on the surface of a target cell and creates a pore in the membrane, resulting in target cell death.

peripheral lymphoid organs

Biology; Immunology

Lymphoid organs other than the thymus; include spleen, lymph nodes, and mucosal associated lymphoid tissue.

peripheral tolerance

Biology; Immunology

Tolerance induced in mature lymphocytes outside the thymus.