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Fig. 2 Details of adult phenotypes in iridophore mutants. Images of the anterior trunk of fixed animals photographed under white light. L-iridophores (black arrows) and dense S-iridophores (white arrows) reflect maximally at different angles of light and therefore shine up in different anteroposterior regions. Insets in A-C demarcate the magnified views in A′-C′ that were taken under UV light to avoid reflections from iridophores and to highlight xanthophores. Under this illumination, L-iridophores are visible as bundles of greyish vertically oriented fibres (black arrows). (A,A′) Wild-type fish. (B,B′) rse mutant fish. An illumination was chosen to avoid reflection of L-iridophores, whereas S-iridophores are visible (white arrow). L-iridophores, which are largely restricted to melanophore regions in wild type (A,A′, black arrows), expand into interstripe regions in rse mutants (B,B′). The light appearance in stripe 1D in B′ is due to the absence of L-iridophores. (C,C′) shd mutant fish. Ventrally, some of the melanophore patches (grey arrows) appear to be located between 1V and 2V. The light area in X0 in C′ is probably due to reflective properties of musculature.