DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Autumn leaf. Close-up of the surface of an oak leaf (Quercus sp.) showing autumn colour. The green pigment, chlorophyll, has been completely broken down to reveal the red pigment which is usually hidden. The veins can be seen as a pale network against the coloured leaf, with thicker veins showing as red. The leaf's main vein, the midrib, is seen running down centre.
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