Page 1552 - Veterinary Immunology, 10th Edition

myeloma cell.
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N

N-terminus The end of a peptide chain with a free amino (NH )
2
group.

Natural antibodies Antibodies against foreign antigens found in
serum in the absence of known antigenic stimulation from

immunization or an infection. Most probably arise as a result of
exposure to cross-reacting bacterial antigens.

Natural killer cells Innate lymphocytes that are found in normal,

unsensitized individuals and that can recognize and kill
abnormal cells such as tumor- and virus-infected cells.

Natural suppressor cells A population of innate cells found in
unimmunized individuals that have the ability to suppress some
immune responses.

Necrosis Cell death due to pathological causes.

Negative feedback A control mechanism whereby the products of
a reaction act to suppress their own production.

Negative selection The killing of T cells that have the potential to
react to self-antigens. A key mechanism in the prevention of
autoimmunity.

Nematode A roundworm.

NETosis The exocytosis of a DNA net by a leukocyte in order to
trap nearby microorganisms.

Neutralization Blockage of the activity of an organism or a toxin by
antibody.

Neutropenia Low numbers of neutrophils in blood.

Neutrophilia High numbers of neutrophils in blood.

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