After we expose our polypeptide to not just one proteolytic enzymes, but several proteolytic enzymes to basically determine what the order of our segments are. So step number one is we take the long polypeptide. We essentially cleave it with these different types of proteolytic enzymes and proteolytic molecules. We produce these segments. Then we essentially isolate the segments by using some type of purification method. Once we isolate them, we use the Edmund degradation process to sequence them so that we know exactly what the sequence is in each one of our segments is.