Fig. 3.

Tiger salamander photoreceptors. (A) Size comparison of rod photoreceptors in mouse and tiger salamander. Outer segment regions are highlighted with green shading and reproduced in the center for direct comparison. Scale bars: 10 μm. Original electron microscope images adapted from [41] (mouse) with permission (John Wiley and Sons, Copyright 1979 The Wistar Institute Press) and from [40] (tiger salamander) with permission (Copyright 1986 The Royal Society). (B) Six types of tiger salamander photoreceptors. The figure shows morphologies (left) as well as sensitivity to wavelength (right, top) and to flash intensity (right, bottom; obtained at preferred wavelength and normalized to peak response). Adapted from [121] with permission (John Wiley and Sons, Copyright 2013 Wiley Periodicals Inc.).