Fig 1. Melanopsin has 38 putative sites of C-terminus phosphorylation.

Serine and threonine residues are represented by colored circles. Clusters of six putative phosphorylation sites of interest, denoted as P-I, P-II, P-III, P-IV, are in different colors. The proximal C-terminus is defined as the region that includes P-I and P-II, while the distal C-terminus includes P-III, P-IV, and beyond. Figure made using Protter [52].