protein drugs protein electrophoresis protein encoded protein engineering protein expressed protein expression protein extract protein extracted protein extraction protein extracts protein families protein family protein feed protein folding protein food protein foods protein forms protein formulations protein found protein fraction protein fractions protein fragment protein fragments protein function protein gene protein genes protein glycosylation protein had protein has protein has a molecular weight protein have protein having protein helps protein hormones protein hydrolysate protein hydrolysates protein identification protein identified protein in it protein in the blood protein in the body protein in the diet protein in the urine protein in urine protein in your diet protein include protein includes protein increases protein inhibitors protein intake protein interaction protein interactions protein involved protein is a human protein is a protein protein is called protein is composed protein is derived protein is detected protein is encoded protein is essential protein is expressed protein is found protein is important protein is indicated protein is known protein is made protein is necessary protein is needed protein is one protein is present protein is produced protein is provided protein is purified protein is required protein is shown protein is the most protein is used protein isoforms protein isolate protein isolates protein kinase protein kinase activity protein kinase c protein kinase inhibitor protein kinase inhibitors protein kinases protein known protein layer protein level protein levels protein loading protein loss protein made protein makes protein marker protein markers protein mass protein material