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(A) DIC and (B) zoom-in photocurrent images of neurites, at day 8 in culture, on top of a graphene transistor. (C) Photocurrent responses of a graphene-synapse junction (a black triangle in Fig. 4B) upon three high-K+ stimulation cycles (90–4–90–4–90–4). (D) Spontaneous waveform of a spike burst indicated by a blue dotted rectangular in Fig. 4C.
