proteins Definition

any of various naturally occurring extremely complex substances that consist of amino-acid residues joined by peptide bonds, contain the elements carbon, hydrogen, nitrogen, oxygen, usually sulfur, and occasionally other elements (such as phosphorus or iron), and include many essential biological compounds (such as enzymes, hormones, or antibodies)

the total nitrogenous material in plant or animal substances

a polypeptide composed of one or two antibody light chains that is found especially in the urine of persons affected with multiple myeloma

an amyloid that is derived from a larger precursor protein and is the primary component of plaques characteristic of Alzheimer's disease —called also A-beta, amyloid beta, amyloid beta peptide, amyloid beta protein

a compound of a protein with a nonprotein

a protein present in blood serum in various abnormal states (such as inflammation or neoplasia) —abbreviation CRP

any of a group of molecular chaperones that are produced especially in cells subjected to stressful conditions (such as high temperature) and that serve to stabilize proteins and ensure proper assembly and folding of proteins

a glycoprotein found especially on the cell surface of neurons in the brain and spinal cord that sometimes occurs in an abnormal misfolded form which proliferates by inducing the normal protein to convert to the misfolded pathogenic form —abbreviation PrP

any of several colloidal light-sensitive preparations of silver and protein used in aqueous solution on mucous membranes as antiseptics

a protein (such as a globulin) that yields amino acids as the chief or only products of complete hydrolysis

protein from some vegetables and especially soybeans used as a substitute for or added to meat