Fig. 2. Reintroduction of the missing cell type restores stripes in fms and nac. (A,B) Transplantation of ß-Actin GFP expressing golden mutant cells into fms hosts. (A) Normally pigmented, donor-derived fms mutant melanophores form a stripe pattern if they are in proximity of xanthophores. Melanophores further away from the xanthophore clone form the typical melanophore clusters seen in fms mutants. (B) UV-illumination shows GFP+, wild-type xanthophores forming stripes with fms mutant melanophores. The xanthophores form a coherent domain; however, several xanthophores have invaded the melanophore stripe (arrows). Some of the GFP signal within the melanophore stripe is due to transplanted cells underlying the melanophore stripe. (C,D) Transplantation of bpeGFP cells into nac hosts. (C) Melanophores form stripes of relatively normal position and size. (D) Fluorescence image of the same sample. Host-derived xanthophores (arrows) display pteridine autofluorescence around their nuclei. GFP+ xanthophores (arrowheads) show fluorescence in the entire cell. In the proximity of melanophores, both donor- and host-derived xanthophores organise into stripes, whereas outside the melanophore clone, xanthophores form the nac mutant pattern.