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Leukocyte
A colorless cell in the blood, lymph and tissues that is an important component of the body's immune system. Also called white blood cell.
Library
A set of cloned DNA fragments that taken collectively contain the entire genome of an organism. Also called a DNA library.
Ligase
An enzyme used to join DNA or RNA segments together.
Linkage
The tendency for certain genes to be inherited together due to their physical proximity on the chromosome.
Linker
A fragment of DNA with a restriction site that can be used to join DNA strands.
Lipoproteins
A class of serum proteins that transport lipids and cholesterol in the bloodstream. Abnormalities in lipoprotein metabolism have been implicated in certain heart diseases.
Lymphocyte
A type of leukocyte found in lymphatic tissue in the blood, lymph nodes and organs. Lymphocytes are continuously made in the bone marrow and mature into antibody-forming cells. See also B lymphocytes; T lymphocytes.
Lymphokine
A class of soluble proteins produced by white blood cells that play a role, as yet not fully understood, in the immune response. See also Interferon; Interleukin.
Lymphoma
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