So these are basically the proteins that combine, that glue our individual cells together to form our tissues. And some examples include integrates as well as Catherine, and we'll talk more about these types of proteins when we get into biochemistry. Now, the final type of major constituent of the extracellular matrix inside tissues is the proteoglycan. Now the proteoglycan itself is a protein that contains a carbohydrate component. And usually in the extracellular matrix, proteoglycans are attached to molecules known as glycosaminoglycans. So these are found in connective tissue as well as are responsible for functioning in cell Adhesion.