And four of these amino acids are actually glycosylated. So three of these amino acids are asparaging amino acids, and that means we have the N glycocitic bonds, and one of these amino acids is the Serene amino acid, and that means we have the O glycocitic bond. And so this brown section, which actually looks like a bunny, this brown section is the protein component of erythropolietin. And these are these four oligosaccharides, which are bound onto these four different amino acids. Three of them are asparagus, three of them are asparagine, and one of them is the serene. Now, what exactly is the function of erythropletin?