. . . "Definition: A physical entity consisting of a sequence of amino acids; a protein monomer; a single polypeptide chain.\nExamples: The epidermal growth factor receptor (EGFR) protein."^^ . "Definition: A physical entity consisting of a sequence of amino acids; a protein monomer; a single polypeptide chain.\nExamples: The epidermal growth factor receptor (EGFR) protein."^^ . "Definition: A physical entity consisting of a sequence of amino acids; a protein monomer; a single polypeptide chain.\nExamples: The epidermal growth factor receptor (EGFR) protein."^^ . . . . . . . . . . . . . . . . . . . . . .