So in our hypothetical example, we're going to use the same exact protein that we used previously. So, Alanine, arginine, phenylalalanine, glycine, aspartate and glycine. So once again, I give you the exact sequence to basically demonstrate how this procedure works. But normally you're not going to know the sequence of your proteins. So let's begin with step one. So, in the first step of the evidengration, we want to basically label that first amino acid.