And that's exactly what gives the mucous membranes the ability to lubricate those epithelial cells. On top of that, these carbohydrates are very sticky and they can basically trap pathogenic and infectious agents. And so that means the mucints that form the mucus barriers basically have the ability to lubricate and protect epithelial tissue. Now, let's move on to the second type of glycoprotein that we'll find inside our body. And this is known as erythropoietin, or EPO. Now, urethropoietin is a glycoprotein, and the protein component basically consists of an amino acid sequence of 165 amino acids.