Dvir Gur, Dr. Yael Politi, Prof. Berta Sivan, Prof. Peter Fratzl, Prof. Steve Weiner and Prof. Lia Addadi Guanine-Based Photonic Crystals in Fish Scales Form from an Amorphous Precursor Angewandte Chemie International Edition 52
Starting from disorder: Anhydrous guanine crystals compose the photonic arrays responsible for the skin and scale iridescence found in Japanese Koi fish. These guanine crystals were found to form in intracellular vesicles (see picture) through an amorphous precursor phase. A combined cryo-SEM and synchrotron radiation X-ray diffraction study showed the evolution of the crystals in great detail.
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