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Topic: Essential amino acid

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 Essential Amino Acid   (Site not responding. Last check: 2007-10-23)
transamination reaction is not reversible, lysine is an essential amino acid.
Many amino acids are used to synthesize other molecules, such as tryptophan which is a precursor of the neurotransmitter serotonin, and glycine which is one of the reactants in the synthesis of porphyrins such as heme.
In humans, the essential amino acids are lysine, leucine, isoleucine, methionine, phenylalanine, threonine, tryptophan, valine, and (in children) histidine and arginine.
www.allamino.com /essential-amino-acid_2.html   (1033 words)

 L-Glutamine: The Conditionally Essential Amino Acid
Of the 20 amino acids in our bodies, nine are considered "essential" and the other 11 are termed "non-essential." The essential amino acids need to be obtained from our diet, as opposed to the non-essential ones, which our body can manufacture on its own.
However, most scientists now consider glutamine to be a "conditionally" essential amino acid, because under certain conditions we are unable to make adequate amounts and thus need to obtain it from outside sources.
Amino acid transport during muscle contraction and its relevance to exercise.
www.health-marketplace.com /article-Glutamine.htm   (1424 words)

 Essential amino acid - InfoSearchPoint.com   (Site not responding. Last check: 2007-10-23)
Methionine and homocysteine, sulfur containing amino acids, can be converted one to the other, but neither can be synthesized from scratch in humans.
Cysteine can be made from homocysteine, but it also cannot be synthesized from scratch.
In mammals other than humans, amino acids regarded as essential can be considerably different.
www.infosearchpoint.com /display/Essential_amino_acid   (368 words)

 essential amino acid
An amino acid that an organism cannot synthesize and therefore has to be ingested as part of the diet.
Of the 20 amino acids used in the human body, 8 of them are "essential." They are lysine, threonine, methionine, isoleucine, leucine, valine, phenylalanine, and tryptophan.
Two others, arginine and histidine, are essential only in children.
www.daviddarling.info /encyclopedia/E/essential_amino_acid.html   (125 words)

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