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label:
Chemical group or radioactive atom added to a molecule in order
to follow its progress through a biochemical reaction or to
locate it spatially. Also, as a verb, to add such a group or
atom to a cell or molecule.
lagging strand:
One of the two newly made strands of DNA found at a replication
fork. The lagging strand is made in discontinuous lengths that
are later joined covalently.
lambda bacteriophage (
l bacteriophage):
Virus that infects E. coli; widely used as a DNA cloning
vector.
lamin:
Extracellular matrix protein found in basal laminae.
lamins:
Intermediate filament proteins that form the fibrous matrix
(nuclear lamina) on the inner surface of the nuclear envelope.
leading strand:
One of the two newly made strands of DNA found at a replication
fork. The leading strand is made by continuous synthesis in
the 5´-to-3´ direction.
lectin:
Protein that binds tightly to a specific sugar. Abundant lectins
derived from plant seeds are often used as affinity reagents
to purify glycoproteins or to detect them on the surface of
cells.
leucine zipper:
Structural motif seen in many DNA-binding proteins in which two
a helices from separate proteins are
joined together in a coiled-coil, forming a protein dimer.
Leucocyte:
see white blood cell
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