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The surface morphology of synchronized P815Y mastocytoma cells has been examined by scanning electron microscopy.  Early G1 cells are comparatively smooth or light villated, whereas at later stages the surface becomes progressively more villated.  In G1 cell most microvilli have a uniform diameter, whereas in S and G2 cells, many microvilli show branching and often originate from much larger surface protuberances.  Small "blebs" are seen on the surface of many cells but these structures do not appear to be a characteristic feature of cells at any one stage of the cycle.  The presence of microvilli increases the total surface of the cell to such an extent that the ratio of volume to surface area remains constant throughout the cell cycle.  The mechanism of cytokinesis is thus a physical one, involving the unfolding of previously accumulated microvilli.

Role of microvilli in surface changes of synchronized P815Y mastocytoma cells.