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The self‐assembly of guanine‐based peptide nucleic acid monomers into photonic crystals is described. A highly reflective lattice of guanine nanocrystals is found in the skin and ocular tissues of different species providing vivid structural colors. The fabricated guanine‐based supramolecular structures respond to changes in osmolarity similar to the active spectral change mechanism employed by chameleons...
Guanine crystals are present in the skin of a wide range of animals, providing vivid structural colors. Growing guanine crystals with similar optical properties in vitro is a still unmet challenge. Using guanine‐based peptide nucleic acid monomers, a reflective array of self‐assembled spheres is developed by E. Gazit and co‐workers, as described on page 2195. The guanine‐based supramolecular structure...
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