necrotizing vasculitis
Inflammation of blood vessels involving the localized death of living cells.

neuron
A cell specialized to conduct and generate electrical impulses and to carry information from one part of the brain to another.

neurotoxin
A substance that is poisonous to nerve tissue.

neurotransmitter
Chemicals that act as messengers between cells in the brain and nervous system; they transmit impulses across the gap from a neuron to another neuron, a muscle, or a gland.

neutrophil
The major circulating phagocytic polymorphonuclear granulocyte. Enters tissues early in an inflammatory response and is also able to mediate antibody-dependent cell-mediated cytotoxicity (ADCC)

notochord
A flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates.

nucleoplasm
The fluid contained within the nucleus of a eukaryote in which the chromosomes and nucleoli are found.