Not to be confused with Retinal. Retinol, also known as Vitamin A1, is a vitamin found in food and used as a dietary supplement. As a supplement it is used to treat and prevent vitamin A deficiency, especially that which is resulting in xerophthalmia.
Desmosomes are anchoring junctions â mechanical couplings scattered like rivets along the sides of adjacent cells to prevent their separation. On the cytoplasmic face of each plasma membrane is a thickening called a plaque.
Epithelial cells are held together by strong anchoring (zonula adherens) junctions. The adherens junction lies below the tight junction (occluding junction). In the gap (about 15-20nm) between the two cells, there is a protein called cadherin-a cell membrane glycoprotein.(The type of cadherin found here is E-cadherin). occluding junctions (zonula occludens or tight junctions). 2  adhering junctions (zonula adherens). 3  desmosomes (macula adherens). 4  There are also ' hemidesmosomes ' that lie on the basal membrane, to help stick the cells to the underlying basal lamina.