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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 Form of cancer that affects the lymph tissue.
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