HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Calcium oxalate crystals (green) in onion peel, light micrograph. Calcium oxalate is a chemical that accumulates in plants as a product of processes that remove excess calcium, prevention calcium toxicity. Magnification: x280 when printed at 10 centimetres across.
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