Untitled - D Ank Unlimited

F-actin
Actin molecules in a dual-stranded helical polymer.
Together with the tropomyosin–tropinin regulatory
complex, F-actin constitutes the thin filaments of skeletal
muscle.
f allotype
A rabbit immunoglobulin A (IgA) subclass α heavy-chain
allotype. Allelic genes at the f locus encode five f allotypes
designated f69 through f73. More than one allotypic determinant
is associated with each allotype.
f-Met peptides
Bacterial tripeptides such as formyl–Met–Leu–Phe that
are chemotactic for inflammatory cells, inducing leukocyte
migration.
F protein
A 42-kDa protein in the cytoplasm of murine hepatocytes.
It occurs in F.1 and F.2 allelic forms in separate inbred
murine strains.
F 1 hybrid
The first generation of offspring after a mating between
genetically different parents, such as from two different
inbred strains.
F 1 hybrid disease
A graft-vs.-host reaction that takes place after the F 1
hybrid is injected with immunologically competent lymphoid
cells from a parent. Whereas the hybrid is immunologically
tolerant to the histocompatibility antigens of the
parent, the injected T lymphocytes from the parent react
against antigens of the other parent that are expressed in
tissues of the F 1 hybrid, producing the graft-vs.-host-like
reactivity. The severity of the reaction depends on the
histocompatibility differences between the two parents of
the F 1 hybrid.
F 1 hybrid resistance
A condition that results when two inbred mouse strains
are crossed and a bone marrow graft from either of the
parents is rejected by the F 1 offspring. Attributable to
variation in NK inhibitory receptor expression by F1
natural (NK) cells.
F 2 generation
The second generation of offspring produced following a
specific mating.
Fab fragment
Fragment, antigen-binding. A product of papain digestion
of an immunoglobulin G (IgG) molecule. It is comprised
of one light chain and the segment of heavy chain on the
N terminal side of the central disulfide bond. The light and
heavy chain segments are linked by interchain disulfide
bonds. Its weight is 47 kDa and its sedimentation coefficient
is 3.5 S. The Fab fragment has a single antigen-binding site.
Each IgG molecule has two Fab regions.
F
Fab fragment.
Fab′ fragment
A product of reduction of an F(ab′) 2 fragment that results
from pepsin digestion of immunoglobulin G (IgG). It is
comprised of one light chain linked by disulfide bonds
to the N terminal segment of the heavy chain. The Fab′
fragment has a single antigen-binding site. Each F(ab′) 2
fragment has two Fab′ fragments.
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F