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(a) Schematic of fiber-optic two-photon optogenetic activation. (b) Composite image of two-photon fluorescence from polystyrene particles (green) and excitation intensity pattern (red). (c) Inward current responses due to fiber-optic two-photon beam (850nm) at different average power densities, (d) Dependence of inward-current as a function of power densities (100 ms pulses) [118].
