But the other side that faces our basement membrane is known as the basil lateral side or simply the basal side. So we have this basal side that is attached to our basement membrane. And the basement membrane simply is a matrix that consists of specialized proteins and other molecules whose function is to basically act as a base for these cells. So the basement membrane provides an attachment point for these epithelial cells. And below the basement membrane, we have some sort of connective tissue. So we have these blood vessels, we have our capillaries, we have these veins that basically provide the nutrients to these cells and also take away the waste products that are secreted by these cells.