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eucaryote (eukaryote):
Living organism composed of one or more cells with a distinct
nucleus and cytoplasm. Includes all forms of life except viruses
and bacteria (procaryotes).
euchromatin:
Region of an interphase chromosome that stains diffusely; "normal"
chromatin, as opposed to the more condensed heterochromatin.
exocytosis:
Process by which most molecules are secreted from a eucaryotic
cell. These molecules are packaged in membrane-bounded vesicles
that fuse with the plasma membrane, releasing their contents
to the outside.
exon:
Segment of a eucaryotic gene that consists of DNA coding for
a sequence of nucleotides in mRNA; an exon can encode amino
acids in a protein. Usually adjacent to a noncoding DNA segment
called an intron.
expression:
Production of an observable phenotype by a gene - usually by
the synthesis of a protein.
expression vector:
A virus or plasmid that carries a DNA sequence into a suitable
host cell and there directs the synthesis of a specific protein.
extracellular matrix (ECM):
Complex network of polysaccharides (such as glycosaminoglycans
or cellulose) and proteins (such as collagen) secreted by cells.
Serves as a structural element in tissues and also influences
their development and physiology.
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