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Cutin is a substance that forms a protective, water-impervious layer on the outer epidermal cells of plants, particularly on leaves and fruits. This layer, known as the cuticle, is composed of cutin, which is a waxy material similar to suberin.1

The cuticle's primary function is to prevent excessive water loss from the plant and to act as a barrier against mechanical injury and infection. Cutin is especially noticeable on fruits like apples and cherries, giving them a glossy appearance. It is an insoluble mixture that includes waxes, fatty acids, and resins.213

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3 Britannica Sources
  1. cuticle
  2. epidermis
  3. cutin

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