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GenSight Biologics Announces the Publication in Communications Biology of the Proof-of-Concept for GS030-Drug Product in Non-Human Primates The ex vivo retinal stimulation assays also showed that the electrophysiologic response of RGCs expressing ChrimsonR precisely followed the duration and frequency of the light pulses used to activate the opsin. Moreover, localized stimulation of RGCs induced a response coherent with the size and position of the light pulses. Optogenetic stimulation of RGCs expressing ChrimsonR-tdT can support restoration of visual acuity The electrophysiological activity of RGCs expressing ChrimsonR-tdT was consistent with the direction and speed of a moving stimulus. Furthermore, the spatiotemporal activation of treated retinas was specific to the shape of the moving symbols presented (square, circle, cross of different sizes), indicating the ability to discriminate between patterns. This level of pattern discrimination corresponded to a Sne ....