Figure 1.

The roy orbison mutant phenotype, one of the two strains found in the transparent casper strain. During embryogenesis, roy lacks nearly all reflective iridophores, but melanophore development is relatively normal. In contrast, as adults, roy has a severe defect in both iridophores and melanophores. casper is largely similar to roy except that it also has a mutation in mitfa, leading to complete loss of all pigmented melanocytes.