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Protein

Protein Primary Structure

Proteins are polymers of amino acids.

Each amino acid has the same fundamental structure, differing only in the side-chain, designated the R-group. The carbon atom to which the amino group, carboxyl group, and side chain (R-group) are attached is the alpha carbon (Ca).
Basic Concepts of Protein Structure

A protein (from the Greek protas meaning “of primary importance”) is a complex, high-molecular-mass, organic compound that consists of amino acids joined by peptide bonds. Proteins are essential to the structure and function of all living cells and viruses.
Wikipedia Discussion(, Details)