Webster's New World Medical Dictionary

fusiform aneurysm
07_189283 ch06.qxp 4/18/08 10:15 PM Page 169
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07_189283 ch06.qxp 4/18/08 10:15 PM Page 170
http://www.rashidislamiccenter.com
http://www.allofislam.com/

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G
In genetics, guanine, one member of the G-C
base pair (guanine-cytosine) in DNA. See also 
DNA;
guanine; RNA.
G protein
A guanine nucleotide binding protein
in cells that interacts with cell surface receptors and
affects biochemical actions within cells.
G6PD
Glucose-6-phosphate dehydrogenase, an
enzyme that red blood cells rely heavily on because
it protects the cells against oxidative stresses. See
also 
deficiency, G6PD.
GAG
Glycosaminoglycan.
gait
A manner of walking. Observation of gait can
provide early diagnostic clues for a number of dis-
orders, including cerebral palsy, Parkinson’s dis-
ease, and Rett syndrome.
galactose
A sugar found in milk. Galactose is a
disaccharide that is made up of two sugars, galac-
tose and glucose, that are bound together.
galactosemia
An inherited disorder of galactose
metabolism that occurs in newborns and can result
in damage to the liver, brain, kidneys, and other
organs in infants due to the accumulation of galac-
tose derivatives in the body. Individuals with galac-
tosemia cannot tolerate any amount of human or
animal milk intake. The symptoms of galactosemia
resolve if a diet that restricts the intake of galactose
and lactose is started during the first 10 days of life.
Galactosemia is inherited as an autosomal recessive
trait. Galactosemia is due to deficient activity of the
enzyme galactose-phosphate uridyltransferase
(GALT). Molecular testing for the gene that produces
GALT permits carrier detection, genetic counseling,
and prenatal diagnosis.