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Matrigel containing gold nanorods injected into an in vivo mouse ear showing blood flow via speckle variance (red) and nanorods via PTOCT (green). (a) Blood flow without nanorods and with modulating laser off. (b) Blood flow without nanorods and with modulating laser on. (c) Blood flow with nanorods and the modulating laser off. (d) Blood flow with nanorods and the modulating laser on. (Reprinted with permission from [61]).
