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1 UC Berkeley
2 Cornell University
* To whom correspondence should be addressed. E-mail: werblin{at}berkeley.edu.
We studied the interactions between excitation and inhibition in morphologically-identified amacrine cells in the light-adapted rabbit retinal slice under patch clamp. The majority of ON amacrine cells receive glycinergic OFF inhibition. About half of the OFF amacrine cells receive glycinergic ON inhibition. Neither class received any GABAergic inhibition. A minority of ON, OFF, ON-OFF amacrine cells receive both glycinergic ON and GABAergic OFF inhibition. These interactions were found in cells with diverse morphologies having both wide and narrow processes that stratify in single or multiple layers of the inner plexiform layer. Most ON-OFF amacrine cells receive no inhibition and have monostratified processes confined to the middle of the inner plexiform layer. The most common interaction is "crossover inhibition," where OFF inhibits ON, and ON inhibits OFF. While the morphology of amacrine cells is diverse, the interactions between excitation and inhibition appear to be relatively limited and specific.
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