Alanine is a simple, non-essential amino acid involved in protein synthesis and energy metabolism, especially through the glucose-alanine cycle that helps maintain blood sugar levels. It has a basic structure with a methyl side chain and exists mainly as L-alanine in the human body. It was first identified in the 19th century during early protein studies, with important contributions from Adolf Strecker, who developed early amino acid synthesis methods, making alanine significant in the development of modern biochemistry.
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