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simple protein[′sim·pəl ′prō‚tēn]
a protein that is composed solely of α-amino acids in a peptide bond. Simple proteins are classified according to their solubility in water and saline solutions into seven groups: glutelins, histones, albumins, globulins, prolamins, protamines, and scleroproteins. Proteolytic enzymes, including pepsin, trypsin, chymotrypsin, and papain are also simple proteins.