Page 1549 - Veterinary Immunology, 10th Edition

VetBooks.ir Lymph The clear tissue fluid that flows through lymphatic vessels.

Lymphadenopathy Literally, “disease of lymph nodes.” In practice,
it is used to describe enlarged lymph nodes.

Lymphoblast A dividing lymphocyte.

Lymphocyte A small mononuclear cell with a round nucleus
containing densely packed chromatin found in blood and
lymphoid tissues. Most have only a thin rim of cytoplasm. They

recognize foreign antigens through specialized receptors.

Lymphokine-activated killer (LAK) cells Lymphocytes activated

by exposure to cytokines such as IL-2 in vitro.

Lymphokines Cytokines secreted by lymphocytes.

Lymphopenia Abnormally low numbers of lymphocytes in blood.

Lymphotoxins Cytotoxic cytokines secreted by lymphocytes.

Lysosomal enzymes The complex mixture of enzymes, many of
which are proteases, found within lysosomes.

Lysosomes Cytoplasmic organelles found within phagocytic cells
that contain a complex mixture of potent proteases.

Lysozyme An enzyme present in tears, saliva, and neutrophils. It
attacks carbohydrates in the cell walls of Gram-positive bacteria.

M

Macrophages Large phagocytic cells containing a single rounded
nucleus.

Major histocompatibility complex The gene region that contains
the genes for the major histocompatibility molecules, as well as

for some complement components and related proteins.

Malignant tumors Tumors whose cells have a tendency to invade

normal tissues, break away, and spread by lymphatics or blood

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