Fig. 1. Adult stripe development and loss in danios. (A) Adult D. rerio exhibit dark stripes of melanophores and iridophores (with few xanthophores), alternating with light stripes of xanthophores and iridophores (with few melanophores). (B) Adult D. albolineatus lack distinctive melanophore stripes and exhibit only a weak interstripe region posteriorly. (C) fms mutant D. rerio exhibit disrupted stripes in which metamorphic melanophores are reduced and xanthophores are absent. (D) Detail of stripes and interstripes in D. rerio. Dark cells are melanophores and yellow-orange cells are xanthophores (arrow). Reflective iridophores are found throughout, but are organized differently in interstripe regions (arrowheads); under this illumination, iridophores outside of the interstripe region are evident only by their blue iridescence over some melanophores. (E) Detail of pigment pattern in D. albolineatus adult. Melanophores are widely distributed over the flank. Adults exhibit reddish erythrophores (arrow) distributed widely over the flank and interstripe iridophores (arrowheads) form only a narrow, irregular band over part of the flank. Erythrophores are present in several other danios as well, although not in D. rerio. Adult fish are 25-30 mm in length. Scale bars in D: 200 µm for D,E.