these are junctional complexes with tight junctions ( zonula occludents ) in the apical parts of contacting sides of cells of the inner leaf : a great quantity of mitochondria , ribosomes and various vesicles , well developed endoplasmic reticulum in the cytoplasm , much folded basal surface , gap junctions between cells of external and internal leaflets .
C0014239
endoplasmic reticulum
C0007634
cells