part of part of overlaps overlaps organ part iris iris epithelium dorsal iris 2023-06-06T08:06:04Z In urodeles, lens regeneration proceeds through two steps. The first step involves the entire circumference of the iris pigmented epithelium. The second step is confined to the pigmented epithelial cells located along the dorsal rim of the iris and involves dorsal-specific activation of the Wnt signaling pathway. UBERON:8480063 dorsal rim of the iris The dorsal part of the iris. In urodeles (newts and salamanders) the dorsal iris is involved in lens regeneration in a process named Wolffian lens regeneration. Paula Duek Roggli