Alanine amino acid crystals, light micrograph

Alanine amino acid crystals, light micrograph

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Credit: ANTONIO ROMERO/SCIENCE PHOTO LIBRARY

Caption: Polarized light micrograph of alanine crystals, a non-essential amino acid in humans, used in the biosynthesis of proteins and involved in the metabolism of tryptophan and vitamin pyridoxine. As an amino acid, it is second only to leucine in rate of occurrence. It is present in bacterial cell walls and in some peptide antibiotics. It is found in a wide variety of foods, and particularly concentrated in meats.
Alanine plays a key role in the glucose-alanine cycle between tissues and the liver. Linked to diabetes and hypertension, it is an important source of energy for muscles and the central nervous system, strengthens the immune system, and promotes lymphocyte production. It constitutes a substrate for hepatic gluconeogenesis and ureagenesis, and is also known to cause cytotoxic oxidative stress in brain tumour cells. Field of view size: 0. 74 x 1. 11 mm.

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Keywords: alanine, amines, amino acid, antibiotic, bacterial cell wall, bacteriology, biochemistry, bioengineering, biomedical engineering, biotechnology, crystal, drug, gluconeogenesis, glucose, glucose metabolism, glycolysis, hypertension, hypoglycemia, immune system, immunity, immunology, light micrograph, medical research, medicine, metabolism, molecular biology, muscle metabolism, nervous system, neurology, neuroscience, non essential amino acid, organic compounds, peptidoglycan, pharmacology, pharmacotherapy, photomicrograph, polarized light, pyridoxine, pyruvate, tryptophan

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