Figure 1 in The shell-eyes of the chiton Acanthopleura granulata (Mollusca, Polyplacophora) use pheomelanin as a screening pigment

Figure 1. The results of using sodium hydroxide to extract pigment from the decalcified shell plates of the eyed chiton Acanthopleura granulata. (A) An image taken before bleaching, where the dark spots are the rings of screening pigment associated with the shell-eyes (the arrow points to a single eye). The same red-brown pigment is expressed around the shell-eyes and, more broadly, in the proteinaceous extra-cellular matrix that surrounds the eyes and aesthetes. (B) The same valve after 48 h in 1 M sodium hydroxide at room temperature. The scale bar represents 1 mm.