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Two-photon excited fluorescence images of the inlets (top) and of the main channel towards the outlet (bottom) of a Y-shaped MFD in which a solution of Au NP in water is mixed with pure water (left column), complete culture medium with 2% serum (central column) or 2% serum in water (right column). The Au NP solution is always injected in the upper inlet of the Y. Fluorescent emission/scattering form the NP or NP aggregates is rendered in green
