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Spiral waves are travelling waves that rotate outward from a center in a spiral. They are a feature of many excitable media. Spiral waves have been observed in various biological systems[1][2] including systems such as heart ventricular fibrillation,[3] Dictyostelium cAMP waves,[4] retinal spreading depression,[5] Xenopus oocyte calcium waves,[6] and glial calcium waves in cortical tissue culture.[7]
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