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Illustration of the experimental procedure. (a) CuInSexS2-/ZnS quantum dots (NCs) dispersed in dichloromethane (DCM) are (b) encapsulated in PLGA microspheres, prior to (c) conjugation with wild-type invasin or non-binding variant D911A. (d) After intragastric gavage, in vivo fluorescence is monitored.
