“…A wide variety of mechanisms could be involved, including direct contacts between melanophores, xanthophores, or their precursors, as well as indirect mechanisms involving secreted signaling molecules, trophic factors, or even intermediary cell types. Interactions within and among pigment cell classes were also inferred long ago from studies of developing and regenerating danio fins (Goodrich and Nichols, 1931;Goodrich et al, 1954;Goodrich and Greene, 1959), and more recently, from studies of stripe and bar development in salamander larvae (Epperlein and Lofberg, 1990;Parichy, 1996;Parichy, 2001), suggesting that such mechanisms may be relatively widespread.…”