What does acanthosis refer to?

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Enhanced rate of cell divisionThickening of the outermost skin layerExpansion of the spinous cell layerDamage to the basal membraneNone of the above

Explanation

Acanthosis specifically describes an increase in the thickness of the spinous layer of the skin. It does not refer to increased cell division, thickening of the superficial layer, or damage to the basal lamina.