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initiation factor:
Protein that promotes the proper association of ribosomes with
mRNA and is required for the initiation of protein synthesis.
inositol:
Cyclic molecule with six hydroxyl groups that forms the hydrophilic
head group of inositol phospholipids.
inositol phospholipids (phosphoinositides):
One of a family of lipids containing phosphorylated inositol derivatives.
Although minor components of the plasma membrane, they are important
in signal transduction in eucaryotic cells.
insulin:
Polypeptide hormone that is secreted by b
cells in the pancreas and helps regulate glucose metabolism in
animals.
integrin:
Member of the large family of transmembrane proteins involved
in the adhesion of cells to the extracellular matrix.
interleukin:
Secreted peptide or protein that mainly mediates local interactions
between white blood cells (leucocytes).
intermediate filament:
Fibrous protein filament (about 10 nm in diameter) that forms
ropelike networks in animal cells. One of the three most prominent
types of cytoskeletal filaments.
internal membrane:
Eucaryotic cell membrane other than the plasma membrane. The membranes
of the endoplasmic reticulum and the Golgi apparatus are examples.
interphase:
Long period of the cell cycle between one mitosis and the next.
Includes G1 phase, S phase, and G2
phase.
intron:
Noncoding region of a eucaryotic gene that is transcribed into
an RNA molecule but is then excised by RNA splicing when mRNA
is produced.
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