div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=positive-and-negative-potential-responses-associated-with-vertebrate-photoreceptorhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: Positive and Negative Potential Responses associated with Vertebrate Photoreceptor Cells loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader030vdocumentssitereader030viewer20220205235750682d1a28ab0f07aef2f6html5thumbnails1jpg width=140 height=200 divp© 1965 Nature Publishing Grouppdivdiv class=ts-pagebutton class=gotoPage data-page=2Page 2button div class=ts-imageimg data-url=positive-and-negative-potential-responses-associated-with-vertebrate-photoreceptorhtmlpage=2 data-page=2 class=ts-thumb lazyload alt=Page 2: Positive and Negative Potential Responses associated with Vertebrate Photoreceptor Cells loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader030vdocumentssitereader030viewer20220205235750682d1a28ab0f07aef2f6html5thumbnails2jpg width=140 height=200 divp© 1965 Nature Publishing Grouppdiv