Page 1557 - Veterinary Immunology, 10th Edition

VetBooks.ir Prostanoids A class of lipid mediators derived from arachidonic

acid produced by the actions of the enzyme cyclooxygenase.
They include prostaglandins, thromboxanes, and prostacyclin.

Proteasome A large complex multienzyme structure found in the
cytosol. It acts on ubiquinated cellular proteins to cleave them
into small fragments.

Protein kinase An enzyme that phosphorylates proteins.

Prozone The inhibition of agglutination by the presence of high
concentrations of antibody.

Pseudogenes DNA sequences that resemble functional genes but
that cannot be transcribed.

Pyrogen A fever-causing substance.

R

Radioimmunoassay An immunological test that requires the use of
an isotope-labeled reagent.

Reaginic antibody An antibody of the IgE class that mediates type
I hypersensitivity.

Recombinant vaccine A vaccine that contains antigen prepared by
recombinant DNA techniques.

Respiratory burst The rapid increase in metabolic activity that
occurs in phagocytic cells while particles are being ingested. It
generates potent oxidants that can kill invading

microorganisms.

Retrovirus An RNA virus that employs the enzyme reverse

transcriptase to convert its RNA into DNA.

Reverse transcriptase An enzyme that reversely transcribes RNA

to DNA. It is found in retroviruses such as FIV.

Rheumatoid factor An autoantibody directed against epitopes on

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