Figure 1.
Schematic representation of mouse and frog photoreceptors drawn roughly to scale. (From Pearring et al., 2013 (1); adapted from Elsevier Ltd. with permission).
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.