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In vivo measurement of visible light propagation. Average light decrease with distance from the illuminator: mean normalized fluence rates representing the fraction of applied light power reaching a given depth for blue (473 nm), green (532 nm), and red (635 nm) light as a function of distance from the illuminator with SE bars. (For blue, green, and red: n = 5, n = 6, and n = 5 mice, respectively).
