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. 2016 Jul 26;6:30259. doi: 10.1038/srep30259

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Copyright © 2016, The Author(s)

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The axonal arbour of BC-3a stratifies across the second sublayer of the IPL (A). Its identity was further confirmed by HCN4 immunohistochemistry of previously recorded cells (B, arrows). Note that the higher magnification images are from a different cell. Upon depolarization, BC-3a expressed outward currents of similar amplitude as BC-2′, but smaller Na⁺ currents (C), while hyperpolarizing voltage steps activated HCN currents (D), sensitive to ZD 7288 (E). Glutamate stimuli triggered fast transient inward currents without a discernible secondary, sustained component (F). Voltage-clamped to 0 mV, glutamate stimulation evoked inhibitory responses (G) except in axotomized cells (inset; bars: 4 pA, 5s), which caused prolonged hyperpolarization under zero-current clamp, after an initial fast depolarization (H).