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TEM of MARY-X spheroids: (A; left panel, B; left panel, arrows) Canalis with extensive microvilli (MV) are found on the interior of several adjoining cells (N; nucleus). (A, B; right panels, note that right panel of B correlates with boxed arrow on the left panel) Found at the apex (apical/lateral) of adjoining cells within the canalis are tight junctions, adherens junctions and desmosomes (TJ; arrow, AJ; arrow and DM; arrow).
