
Protein structure is the biomolecular structure of a protein molecule. Proteins are polymers – specifically polypeptides -sequences formed from various L-α-amino acids. Each unit of a protein is called an amino acid residue because it is the residue of every amino acid that forms the protein by losing a water molecule. By convention, a chain un...
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http://en.wikipedia.org/wiki/Protein_structure

The amino acids and their manner of arrangement in constituting a protein. The four stages of protein structuring are primary (protein structure, primary see amino acid sequence), secondary (protein structure, secondary), tertiary (protein structure, tertiary), and quaternary (protein structure, quaternary see protein conformation). ... (12 Dec 199...
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http://www.encyclo.co.uk/local/20973
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