DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Inulin crystals. Polarised light micrograph of inulin crystals (centre) stored inside a Dahlia sp. root tuber (purple). Inulin is a naturally-occurring plant sugar found in the roots or rhizomes of some plants, which use it as a source of energy. Magnification: x100 when printed at 10 centimetres wide.
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