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A branched-chain amino acid (BCAA) is an amino acid having an aliphatic side-chain with a branch (a central carbon atom bound to three or more carbon atoms). Among the proteinogenic amino acids, there are three BCAAs: leucine, isoleucine, and valine. [1]
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This enzyme catalyzes the reversible transamination of branched-chain alpha-keto acids (BCKAs) to the branched-chain amino acids (BCAAs) valine, leucine and isoleucine, which are essential for cell growth. In humans, its primary role is the deamination of BCAAs, as humans lack the enzymes for de novo synthesis of BCKAs.
Branched-chain amino acids (BCAA) are ubiquitous in many organisms, comprising 35% of all proteins and 40% of the amino acids required in all mammals. [13] Mammalian BCATs come in two isoforms: cytosolic (BCATc) and mitochondrial (BCATm). The isoforms share 58% homology, [15] but vary in location and catalytic efficiency.
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The Jane Schaffer method is a formula for essay writing that is taught in some U.S. middle schools and high schools.Developed by a San Diego teacher named Jane Schaffer, who started offering training and a 45-day curriculum in 1995, it is intended to help students who struggle with structuring essays by providing a framework.
The five-paragraph essay is a format of essay having five paragraphs: one introductory paragraph, three body paragraphs with support and development, and one concluding paragraph. Because of this structure, it is also known as a hamburger essay , one three one , or a three-tier essay .
BCAA may refer to: Branched-chain amino acid; Belgian Civil Aviation Authority; Bermuda Civil Aviation Authority; British Columbia Automobile Association