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State of the art for user-selectable light delivery. Panels (A) and (B): implanted μLEDs with integrated functionalities. Panels (C) and (D): optical fibers for multiplipoint interface and/or integrated drug delivery, Panel (A), reproduced from [36], copyright 2015, with permission from Elsevier. Panel (B), from [37], reproduced with permission from AAAS. Panel (C), reproduced by permission from Macmillan Publishers Ltd: [39], copyright 2015.
