Enzyme assays are laboratory methods for measuring enzymatic activity. Proteins were found to yield amino acids after enzymatic digestion or acid hydrolysis. Advances are occurring to optimize the yield of gelatin using enzymatic hydrolysis of collagen. These inhibitors modify key amino acid residues needed for enzymatic activity. Their interconversion requires either enzymatic or acid-base catalysis. Examples are those involving catalysis and enzymatic reactions. Water is a common reagent in enzymatic catalysis. Isatuximab shows action of an allosteric antagonist with the inhibition of the CD38 enzymatic activity. Ca ultimately binds to many proteins, activating a cascade of enzymatic pathways. For more information on the efficiency of enzymatic catalysis, see the article on "enzymes". Insulin stimulates lipogenesis primarily by activating two enzymatic pathways. Much of the enzymatic processing is post-translational modification of proteins. Some foods also act as inductors or inhibitors of enzymatic activity. Phospholipases A2 include several unrelated protein families with common enzymatic activity. Cyclodextrins are prepared by enzymatic treatment of starch.