And inside our body, in the human body, we have two types of these polypeptide chains that can constitute lactate dehydrogenase. So humans have two isozymic chains for lactate dehydrogenase. We have the H ISome chain and we have the misozyme chain. And it's the H isime chain that is expressed predominantly in high concentration in the cardiac muscle cell. And it's the mike chain that is expressed in high concentration predominantly in the skeletal muscle cell. So if we examine the lactate dehydrogenase in skeletal muscle cells, we're basically going to find a quaternary structure that consists of these four individual chains, where these four individual chains are all the Mi design chains.