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? Well, erythropletin is basically a glycoprotein that is produced by special cells found inside our kidneys. And these glycoproteins are released into the blood plasma and they act as hormones. They basically bind on suspension precursor cells and they stimulate the cells to basically produce erythrocytes, red blood cells.