In order to determine the accurate location of the origin of the so-called cone action potential, the histological approach was taken combined with an electrophoretical technique using a lithium-carmine filled ultra-microelectrode. Further, the data, concerning the problem whether or not the potential was intracellular, were discussed. From these results, it was pointed out that the so-called cone potential could not be attributed to a cone cell, but appeared to be the intracellular potential of the horizontal and amacrine cells.
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